Title: What US states once belonged to Mexico? How did they become part of the US? - Quora
Headings: 
What US states once belonged to Mexico? How did they become part of the US?
Content: How? Well…
Mexico gained independence from Spain in 1821. This war drained Mexico out which contributed to further neglect its Northern territories. While Mexico was at war with Spain, thousands of white colonists, cattleman, adventures, and mercenaries, were coming from other parts of North America that had been already invaded and occupied looking for land and gold they could find and obtain “by any means.” In this process, whites perpetrated horrible crimes against Mexicans, because they believed in the concept k
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The answer is: Texas, Arizona, New Mexico, Colorado, Utah, Nevada and California. How? Well…
Mexico gained independence from Spain in 1821. This war drained Mexico out which contributed to further neglect its Northern territories. While Mexico was at war with Spain, thousands of white colonists, cattleman, adventures, and mercenaries, were coming from other parts of North America that had been already invaded and occupied looking for land and gold they could find and obtain “by any means.”