New York pushed Northward. They pushed to claim all of New England and the food wealth they will need to supply their people now that resources from the Midwest are no longer available. The take over is mostly peaceful as many of the states have large, but mostly non-military populations. They encountered problems when large groups of refugees tried to flee to Canada and rioting ensued.
Illinois was calm. The Midwest Alliance grew steadily by seeking to secure the Great Lakes. They were able to take Ohio through a few fierce, but brief encounters. They also took on Minnesota and the mouth of the Mississippi River.
The West coast was now controlled by the two main powers -- California with its seat of power in San Francisco and The North West Union, centered in Seattle. California gained support and took control of all the states West of the Continental Divide and South of the Union. The North West Union pushed as far as Wyoming.
Leave it to Texas to mess everything up.