No, WWII remains the deadliest war.
This is a stupid question.It's almost impossible to answer as it assumes the U.S. suffers the most casualties and that's simply not true. for example:In WWI the U.S. suffered 126,000 casualties ranking 8th WWII 295,000 rank 15th Vietnam- U.S. 58,169 Vietnam 1,165,000+ So it's simply beginning from a false premise.
They both had an impact. ALL wars will influence/impact their respective generations. Naturally, some will impact more than others. The bloodier the war, the more the impact. WWII, for the US, had more casualties than Vietnam, Vietnam had more casualties than Korea, WWII had more US casualties than WWI did. The US Civil War had more casualties than any of our wars (however, we were fighting ourselves, so one must be careful when using those figures). Casualties aside, it may be said that the greatest impact about WWII was when the world entered the "atomic age", on 06 August 1945, when the atomic bomb was used to end WWII. The war however, had been won. Vietnam's impact may have been that it wasn't.
In World War 2, Germany suffered more casualties than either Italy or Japan. Only Russia and China suffered more casualties than Germany.
If you mean what war had the most US casualties is was the Civil War, over 700,000. More than other wars that have happened since combined.
The majority of casualties other than the obvious war casualties came from being in captivity, starvation, and hypothermia.
Russia
Other than WWII, no.
Of the more than 58,100 Americans who died in Vietnam, 11,465 KIAs were less than 20 years old. The average age of all casualties was 23.11 years old. According to the Department of Defense's Combat Casualty File, the average age of an Army infantryman serving in Vietnam was 22. None of the enlisted grades had an average age of less than 20.
As did GEN Norman Schwarzkopf, who served in the Vietnam War, GEN Colin Powell applied what he learned in Vietnam to, "Operation Desert Storm", in 1991; which resulted in complete victory, and the lowest US casualties (and actually lower than that) since the Spanish-American War of 1898; which was nicknamed the, "Splendid Little War".
Because, all of the casualties were American, on both sides.
President Johnson did not reveal the number of casualties to the American people. The idea that America was having a more difficult time in Vietnam than previously expected was something the government hoped to keep to themselves.
In World War II, America suffered fewer casualties than many other countries (and other major combatants) for several reasons. The most important is that America did not enter the war until over two years had passed. Another reason is that American military leaders generally committed to tactics whereby as much territory could be gained with as little human cost as possible. This commitment entailed the assembly of massive firepower-support for all operations, which frequently led to success with lower casualties than would otherwise have been possible.