Glenn C. Loury spoke on the topic at Arizona State University. An excerpt:
Is this a venal, immoral, and rapacious bandit-society of plundering white supremacists, founded in genocide and slavery and propelled by capitalist greed, or a good country that affords boundless opportunity to all fortunate enough to enjoy the privileges and bear the responsibilities of citizenship? Of course, there is some warrant in the historical record for both sentiments, but the weight of the evidence overwhelmingly favors the latter. The founding of the United States of America was a world-historic event by means of which Enlightenment ideals about the rights of individual persons and the legitimacy of state power were instantiated for the first time in real institutions.