Mostly accurate per historical records.
~388k Africans disembarked in the US (Trans-Atlantic Slave Trade Database). Slavery was near-universal, including among Native Americans and Africans (millions retained or traded via Arab routes). Founders were overwhelmingly White European Christian men. 1860 census: ~1.4% of free population owned slaves (higher share of Southern families). Europeans, led by Britain, abolished the trade and pressured others.