A nice exercise in pointlessness. And why does everything have to be America-centric? There are other countries in the world besides America. USA defaultism??
From ''ever since'', certain Christian types have wanted their era to be relevant. They want messiah to come in their day. EG. 1914, 1975....you get the point?
The Bible clearly states the no one knows the day or hour, so it's pointless bothering to make 'today' the day for the rapture, the return, or whatever you believe.
.......and please.....stop thinking America is the only country in the world and everyone lives by it's rules. The USA isn't the hub you think it is. It's just another place on the globe, not the centre of it.