“But over time, the executive branch grew exceedingly powerful. Two world wars emphasized the president’s commander in chief role and removed constraints on its power. By the second half of the 20th century, the republic was routinely fighting wars without its legislative branch, Congress, declaring war, as the Constitution required. With Congress often paralyzed by political conflict, presidents increasingly governed by edicts.”
One of the proximate causes of the American Revolution was British abolitionism leaking into colonial politics.
You had ex-military ultra-wealth planation owners defecting to the revolution in drovers following Dunmore’s Proclamation.
They were completely fine with collecting rents off their subjects - slave or free. But quite a few of them had strong reservations against chattel slavery (the Spanish Catholics, most notably). And more simply could not stomach the expense of policing transatlantic trade from piracy.
That is what ultimately lead to the outlawing of the practice across Europe.