My first suspiction that the US of A was headed toward irrevocable breakdown and division into at least two countries comes from around 2009, I think. But since the November election and the January inauguration, that sense has not diminished.
Here is some data which supports it, based on the number of counties where the voting trend has been increasingly one-sided.
This graph adjusts the county count to include population numbers inside those counties. The trend is very clear.