On Tuesday, Barack Obama will stand on the steps of the U.S. Capitol and take an oath making him the nation’s first president of African heritage.

The statue of Abraham Lincoln, which sits facing the Capitol in a temple two miles away, will not give two thumbs up. Neither will it weep, commune with the spirit of Martin Luther King or dance a macarena of joy.

The point is obvious, yes, but also necessary given that when Obama was elected in November, every third political cartoonist seemed to use an image of a celebrating Lincoln to comment upon the milestone that had occurred. Lincoln, they told us, would have been overjoyed.

Actually, Lincoln likely would have been appalled. How could he not? He was a 19th-century white man who famously said in 1858 that “there is a physical difference between the white and black races, which … will forever forbid the two races living together upon terms of social and political equality.”

How do you reconcile that with all those cartoons of Lincoln congratulating Obama? You don’t. You simply recognize it for what it is: yet another illustration of how shallow our comprehension of history is, yet another instance where myth supersedes reality.

Not that this is anything new – or that political cartoonists are the only ones susceptible. Indeed, blacks once tended to regard Lincoln with an almost religious reverence. Consider another Lincoln statue, this one in a park east of the Capitol: It depicts Lincoln towering over a newly freed black man who kneels at his feet. While modern eyes might find the image unbearably paternalistic, it represented the heartfelt sentiment of the black men and women who gave it to the city in 1876 in gratitude, they said, for Lincoln freeing the slaves.

Of course, Lincoln freed no slaves. That’s the myth. His Emancipation Proclamation was a military measure to demoralize and destabilize the rebellious South; it covered states he did not govern, but did not apply in slaveholding states that remained under his jurisdiction.

None of which is to deny or diminish the greatness of the 16th president. His greatness stands unquestioned, unquestionable. We would be a very different nation, a lesser nation, without his political genius, his dogged faith in the unsundered Union, his refusal to accept less than Union, even when haunted by reversals and setbacks that would have broken anyone else.

No, the argument is not about Lincoln’s greatness. Rather, it is about our tendency to cherish untextured myths that affirm our preferred narratives. George Washington confessing that he chopped down the cherry tree is one, a parable of honesty that has survived for generations despite the minor inconvenience of not being true. Lincoln the Great Emancipator is yet another.

Abraham Lincoln did not believe in the equality of black people. He did, however – and this was no minor distinction in his era – believe in their humanity. He also abhorred slavery. But he was willing to countenance it if doing so would have vindicated his primary goal: to save the Union.

For him, nothing mattered more. Lincoln held with an indefatigable fervor to the belief that there was something unique, something necessary to preserve, in the union of American states, this government of, by, and for the people. He held to this even when common sense, casualty reports and political reality demanded otherwise.

So, remarkable as it is that America has elected a black man its 44th president, Lincoln might find it more remarkable simply that the country has elected a 44th president at all. That was not always a certainty. He would be glad to know that, 144 years after his death, America continues to surprise itself – the Union endures.

Leonard Pitts Jr. is a columnist for The Miami Herald. His e-mail address is: lpitts@miamiherald.com. Leonard Pitts will be chatting with readers every Wednesday from 1 p.m. to 2 p.m. EST on www.MiamiHerald.com.