M0nica
The war stayed far from the shores of the USA mainly because it had several thousand miles of ocean between each side of it, and decreasing that so that the country was in bomber range was even beyond their capabilities.
But they were heavily involved in the war in Asia, remember Pearl Harbour and you only have to visit the American war cemeteries in Normandy to realise how many young Americans died to free Europe from the genocidal Nazis.
The American routing was Florida, South America, Northern Africa, to the UK. I believe America also flew their bombers in over Canada, Newfoundland, Iceland and on into UK. Bombers were within range.
Yes, they were involved in Pearl Harbour, their fleet was bombed to oblivion as Japanese moved forward toward America. They stopped isolationism, fought until they dropped the bomb in 1945.
Yes, they finally sent troops, many buried in Normandy or Cambridge.
They're isolationists, who didn't want to fight on their land.