Offering a peak at the rest of the world, here's the revised North America. The Texas-California nation is the
Republic of Colorado, one of the premier power (alongside the UAR) of the Continent. Colorado has a centralized unitary government. Colorado has a number of territories, including the Bahamas, Hawaii, Puerto Rico and a number of Pacific Islands.
Mexico remains a federal democratic republic, but had a rougher time than our OTL Mexico, losing the north and south to separatism in TTL's 19th Century. You may also notice Panama and Santo Domingo are controlled by TTL's iteration of Gran Colombia, the premier power of South America, rich in resources and a strong federal republic and representative democracy.
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