Yeah but it's not like that because they're Americans. It's like that because that's what the most powerful countries in the world have done since the dawn of time.
From Rome to the British to America.
And Sinestra is right... America
might be the biggest bully in the playground... but there are other bullies too. ( I say might because I haven't really compared such things... Russia, especially when it was the USSR, or China could possibly be bigger bullies as far as I'm concerned )
China's meddling in Tibet, Sudan, Zimbabwe
Russia's meddling in many of it's former Soviet territories such as the Ukraine, Georgia (they even invaded Georgia!)
There are also loads of unsettled border disputes around the world which have simply been resolved with the more powerful country holding on to territory which is being disputed.