Britain fought the second world war with men and money partly drawn from the empire and that, after the defence of the home islands, the survival of the empire was a fundamental war aim.

Britain and Churchill fought not solely in the name of liberty and democracy, but also with the intention of maintaining the empire, defending vital interests and remaining a great power.

Britain went to war in 1939 in the name of freedom and democracy, but fielded armies within whose ranks were black and brown men who were regarded and often treated as second-class citizens.

No matter that you're a British citizen, no matter that you were born here - your skin colour means you do not have the same rights as others to express critical opinions about your own country.

Even the building of a second British empire in the 19th century never fully healed the wound of losing America, and the end of Britain's imperial prestige after the second world war has cut deeper.

When I was a child, growing up on a council estate in the northeast of England, I imbibed enough of the background racial tensions of the late 1970s and 1980s to feel profoundly unwelcome in Britain.

The history of the British empire, the chapter of our national story that would have explained to my classmates why a child born in Nigeria was sat among them, was similarly missing from the curriculum.

My view as a historian is that the empire was an extractive, exploitative, racist and violent institution and that the history of empire is one we need to confront and come to terms with, rather than celebrate.

Since I began presenting programmes about black history my life has become a constant impromptu focus group. I am stopped in the street by people who want to talk about the histories those documentaries explore.

Along with never having got round to writing down our constitution and having a monarch who legally owns all the swans, one of the things that makes the UK a bit of an outlier is our university admissions system.

I have met other black and mixed-race people who were victims of racism, often far worse than anything I experienced, and who have taken a different path. They moved away from their home towns as soon as they could.

Even in London, at the centre of the wealthiest region in northern Europe, in so many ways insulated from the financial realities faced by the rest of the country, the facts of austerity are becoming harder to ignore.

Britain today is not revolutionary France. There are no grades of citizenship. An immigrant who has just shaken hands at the end of their citizenship ceremony is as British as a member of the oldest family in the land.

Because racism is not like jealousy or selfishness, it is not a primal urge or a basic instinct, it is a 400-year-old political and economic system that has infected our institutions, our culture and even our thinking.

As well as remembering the service of the non-white soldiers and auxiliaries of the first world war, we have also to remember what happened to them and their dreams of justice in the months and years after the armistice.

The nation of 2019, exponentially wealthier, appears to have a fraction of its former self-belief and little faith in its capacity to solve the latest in a long line of housing crises that stretch back to the 18th century.

I don't have any personal memories of the broadcast of 'Civilisation'. I was born the year afterwards. But the many personal stories I have heard from the people it touched do resonate as I had my own television-induced epiphany.

When historians write the last pages of their books, and the producers of history documentaries sit down to edit the final minutes of their programmes, there is often a strong urge to look to the future and emphasise the positive.

I was born in Africa but brought up in the north-east of England. Most of my childhood was spent living on a council estate that overlooked the Tyne and I went to the same junior school as Paul Gascoigne, of whom I have a vague memory.

Donald Trump did not cause America's democratic crisis of faith, he rode to power on it. Once in control, he and other populists discovered their room for manoeuvre was expanded by the same disillusionment that helped them into office.

It is true that Britain and its institutions have survived past crises, but often this was because those in charge, at a certain point, snapped out of the stupor of latent optimism, recognised the dangers circling the nation and acted.

The OBE, CBE and MBE are among the ways Britain honours its citizens for their contribution to national life. I wish we had agreed on a different form of words, but we haven't and the decision to change the system is above my pay grade.

But Johnson's Churchill-lite shtick and Theresa May's even less convincing Iron Lady routine are only even vaguely viable because they tap into a fantasy version of British history that has contaminated visions of our conceivable future.

Racism is a belief system. It was assembled over centuries from many component parts - bits of biblical scripture, the propaganda of the slave-owning lobby and the pseudo-science of academics working in universities in Europe and America.

What we're seeing is a backlash against any attempt, whether from the world of scholarship or popular culture, to paint non-white people back into the British past. Those of us who write about this history have long been familiar with this.

Britain in the 19th century was two things simultaneously; the hub of the largest empire on earth and the greatest manufacturing and trading nation the world had ever seen. Yet the formal empire and the trading empire were not the same thing.

Those of us involved in TV have a habit of using the word 'landmark' a bit too readily. I have been involved in a couple of television projects that, while we were making them, felt quite landmark-ish, but that in retrospect were just good TV.

Each year when the A-level results come out, thousands of students and their families settle down to deal with the implications - positive or otherwise - of the fact that their actual grades differ from those they had predicted by their schools.

Very occasionally, I wish I was French. The fantasy usually materialises just after a holiday, when I dream of living by the warmth of the Mediterranean, or after a trip to Paris during which I indulge fantasies of being a Left Bank cafe-bohemian.

Given that his rousing speeches play on a perpetual loop somewhere in the back of the national psyche, and the bulk of the country is unshakable in its view of Churchill as the greatest of British heroes, how can the historian see him with any clarity?

What needs to be debated is whether IQ tests, as currently designed, are fit for purpose, and capable of measuring the changing nature of intelligence in the 21st century among generations brought up with digital technology and different learning habits.

To describe someone as a pessimist is to issue an insult, whereas to be labelled an optimist is to get a pat on the back. To dismiss someone's argument as pessimistic is to suggest it is the product of a personality disorder, rather than careful analysis.

By 1956, London Transport was recruiting in Barbados, even loaning migrants the costs of their passage to Britain. British Rail placed ads in the Barbados Labour Office and the NHS appealed to West Indian women to come to Britain and train to become nurses.

The refusal to accept that the black presence in Britain has a long and deep history is not just a symptom of racism, it is a form of racism. It is part of a rearguard and increasingly unsustainable defence of a fantasy monochrome version of British history.

While everyone knows that London is both big and overprivileged when it comes to spending, the scale of its dominance is poorly understood. London is not just the biggest city in the UK, it is the biggest city in western Europe. It is also the richest region.

I finally got to watch 'Roots' in my mid-teens, on a video rental. Slowly and meticulously Roots fed its black characters through the mincing machine of American slavery. People with names, hopes and family connections were destroyed and dehumanised before my eyes.

We nonchalantly expect that next year's smartphone will be faster and better than this year's, yet we struggle to imagine that society and our lives could progress at anything like the pace at which technology advances and we meekly accept it when things go backwards.

It is of course perfectly possible for a university, or any institution, to carry out a rigorous investigation into the historical origins of its accumulated wealth, while at the same time putting in place systems to address modern inequalities of access and attainment.

A hard Brexit would be so damaging to the true interests of the UK that what might follow - if we are lucky - is a great unmasking, not just of the political fantasists and chancers who peddled the great Brexit swindle, but of the historical delusion that empowered them.

Our national history cannot be national if, in the near future, one in three young adults feels their stories remain untold, if this country's long global history of empire and interconnections is marginalised and if the historical reality of race is rendered almost invisible.

Many historians will tell you that there are no laws of history and no great cycles that govern human events. History often appears more random than rhythmic. But if not patterns or cycles, there are certainly coincidences and some are so marked that they are hard not to notice.

From daycare to graduation, our education system stacks the odds against the poor. Predicted grades is just one of many hurdles that are set a little higher for those whose parents do not have the money to smooth their path in life or the inside knowledge of how the system works.

The great untruth around which everything pivots is the idea that the defenders of these statues are the defenders of history and truth; while those who want to see them toppled or contextualised are the Huns at the gate, who would destroy national histories and bring down great men.

I think I was eight the first time I saw the Benin bronzes. I was taken to see them at the British Museum by my white, British mother, who felt it important that her half-Nigerian children learned about the artistic achievements of their forefathers. I've been entranced by them ever since.

The old racism of imperialism not only rendered the postwar political elite unable to see black people as full British citizens, it provided them with a whole glossary of stereotypes and preconceptions that they then deployed in order to justify their aim of introducing immigration controls.

The primitive fight-or-flight regions of our mammalian brains react to immediate danger. We instinctively run from an avalanche but the gradual retreat of a glacier, the portent of the far greater danger of rising temperatures and rising oceans, just doesn't get through to us in the same way.

For black and Asian people of my generation, the England team and the cross of St George were once ingredients in a toxic broth. For decades, a minority of England fans brought the nation and the national team into disrepute, bringing violence both to foreign streets and immigrant communities at home.

Schools unable to keep their lights on and their doors open for the full working week is just the latest bleak instalment of a long-running show. The age of austerity returns for its ninth miserable year; always in the background, the common denominator in everything from the Brexit vote to knife crime.

The loss of the American colonies was the first time the process of British empire building had been put significantly into reverse, and became the starting point for a nostalgic yearning for lost colonies - and the wealth and global influence that came with them - that has become part of our national psyche.

Public buildings, built from the rates and taxes paid by past generations, are being auctioned off by impoverished councils who need the money to pay the redundancies of workers they can no longer afford to employ. Many of these grand Victorian buildings will be turned into flats that most people will never be able to afford.

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