USA is the biggest terrorist organisation on the earth, with no country or group even close. Only Nazi Germany and British Empire are statistically in the same ballpark in terms of mass murders.
Good thing you mentioned nazi Germany, because it's actually known figure - 17 milion. That's third place amongst dictatorship countries. Stalin did 23 million, Mao did 74 milion. During colonization actually Belgium was most bloodthirsty with 15 million attributed to Leopold II. From older history Genghis Khan was responsible for about 40 milion.
Recent war on Ukraine is couple hundred thousand in most grave estimates. Afganistan where both US and Russia waged wars lost in total similar number of people. To put things into perspective entire population of Iraq and Afghanistan combined is 83 million.
Then there's case of native Americans which is very hard to assess ranging between 3 and 100 million. But that happened 100 years before USA was established so you have to decide if you want to associate these with USA or European countries.
Considering as anti US stance as possible - about 300 years of US history may more or less equal to 50 years of reign of Mao(though in reality it's probably much lower number). So while they definitely have their sins your original statement doesn't check out from math perspective.
Probably goryllions as your friends nicely put it :-) why are you asking instead providing a number? Whatever I say, somebody will say that this answer is US propaganda, since it will be way to low to support idea that US is baddest of the bad guys.
I agree, weird paragraphs to write because its all bullshit US propaganda with not a sliver of fact in there. Make up facts as you go along, and mix 10% real facts to make it seem like truth.
Your comment actually looks like Mao killed trillions and Stalin killed gorillions.
Russia is currently killing Ukrainians wherever it can. USSR killed millions of people, their own or otherwise. US massacred native Americans and did some really fucked up shit in other countries. So did Russia. Why do you turn this into a political discussion? This is not "US is perfect, Russia sucks". I don't live in US and don't even like it. But a proven fact remains that Russia and USSR (especially under Stalin) were and are a warmongering country with really high kill count.