The first line in the encyclopaedias would always be: “The USA’s first black president.” So it has come to pass.
You could argue President Obama has no legacy, the achievements of eight years already lie shredded by the election of Donald Trump.
Mr Trump has indeed promised to undo Obamacare, the Iran deal, the Paris climate change deal, new environmental rules and regulations and much else that he has derided as “horrible”.
But we can’t really judge Mr Obama’s legacy until we know how profoundly it will be undone.
This will be important.
How history sees Barack Obama depends on Mr Trump, in more ways than one.