Exiled Texas (Collapse of the United States)

Backstory

The Texas Revolution led to an independent Texas. Eventually Texas joined the USA and thus started the Mexican-American War. Texas joined the Confederate States of America (original) but was defeated.

Collapse

After the collapse Mexico seized Texas. Texas did not like this and revolted 2 years later. However, the revolt failed. Instead of giving up the revolutionaries retreated to Southern Oklahoma. They wait there until they can retake what is truly theirs.