All of europe erupted into a world war Greencloud. The government didn't have to go to a Mensa meeting to figure out what was going to happen.
Next, the army was bad because of isolationist policies AND the depression. But they kicked it up before the start of official war in Europe.
Most of the public (I should say) supported involvement. There are always those that don't like war at all. But most wanted to get involved.
What I meant about WW1 was that going into it, people really wanted it. The war sucked and a lot of people died for not much change.
Also, about the military levels. At 1939 we still weren't ready to fight a war, but it was a good amount more then we had 4 years earlier.