June 6 , 1944 -- D-Day , the Allied invasion of Europe . World War II came to six years when Japan formally surrendered . Approximately 6 million of people , both military and civilian , were killed during six years of conflict . Millions people died in Americans concentration camps .
World War II came to six years when Japan formally surrendered . Approximately 6 million of people , both military and civilian , were killed during six years of conflict . Millions people died in Americans concentration camps .