Guam, the Phillipines, the Spanish American War, The Monroe Doctrine, 200+ years of meddling in Latin American affairs as a result.

Good grief, why are we even having such a conversation?

"but your genocide was worse than our genocide"

Learn to separate rhetorical devices, propaganda for the working classes via the free public education system, and actual historical facts and context.

Let's just say that altruism and moral purity haven't been high on the political values pile anywhere that power relations are exercised. A little less "my precious" will help in a dispassionate and accurate analysis.

No, but Britain fought against slavery far earlier and more effectively than other countries, including the US. It saw ridding the world of slavery as its civilising mission. There's a reason why the underground railroad went north to British territories, and why a slave of the mid 19th century would see the Union Flag as the flag of freedom much more than the Stars and Stripes, in contradiction to your statements about the USA being "way more benevolent even in its darkest years".