yes in the last 100 years. people forget Germany, France and Brittian blew the sh*t out of each other for 3 years in WW1 before the US got involved, they did it again in WWII for three years before the US got involved, in that time killing millions upon millions of people.Japan killed a huge number of people before and during the second world war. they invaded and massacured hundreds of thousands of Chinese before they were defeated. Japan also killed around 100,000 Americans during the war, and who knows how many other Chinese, American, British, Austrailians, Indochinese, and Indians died in their death camps.Iran and Iraq have had mass killings since the 50s. Iraq also wipped out an entire generation of Irians in the Iran-Iraq war in the 80s. not to mention the Ethnic cleansing of the Kurds and others.Ehtnic Cleansing is also a huge thing with Serbia. Milosovic killed a lot people, most of which are still undocumented. some estimates put the number as high as 5-6 million.The US has killed a lot of people, but they didn't kill as many as other countries in WWI because they were late comers into the conflict. in WWII the US did inflict a lot of damage, especially to Japan. Korea and Vietnam were also bloody, but I don't have a reliable figure for those numbers, somewhere around 50,000 killed in Korea, and maybe 3 million in Vietnam. but since then, the US has killed relitivly few people in reguards to their capibility to kill. These current wars the number of the dead are again hard to find because the Government is trying to keep that information under wraps, but some reports say that about 1 million people have died because of the US involvment, this is not taking into account the terrorist attacked and insurgencies. the US has no instances inwhich it has done mass killings of its own citizens, and has had only one instance were it executed a POW.