Did duels for offending people's honour ever actually happen in Britain or the US?

by Nutella_Sandwich
Georgy_K_Zhukov

Yes! Dueling was a not all that uncommon in the US and UK at points in their history. Apologies that I can't drop an in-depth post just now, but as this is a topic I've written about before, I can point you to this post on the decline of dueling which touches on your question, and I can do my best to answer follow-ups you might have in a bit.