Which confederacy if you talk about the Deep South confederacy then they are after the united states, but quickly disaper (union crushes). but if you talk about the origional confederacy that were laid down origonaly before the constitution then that is not worth implimenting for it was always on the break of civil war and had no power.
any way untill dec. 7 1941 america was mostly isolationist, towrds europe, not wanting to get in the affairs and the wars of europe. only intervining in 1918 to end the first world war. but beside that we were an regonal power up untill then( when we joined WW2 we were like in the top 30 in army strenght and top five naval strength[ we had to control the pacific])
So that is how we gained militaraly power (idiots guide) cultraly and econmicly we were pretty strong up untill the great depression, (jazz, rap, rock, you can thank us for that)