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That would be a NO. Texas declared independence from Mexico in 1836. It maintained both independence and its borders until 1845 when it was annexed into the United States. In 1846 war was declared and from 1846 to 1848 the US and Mexico fought over the southern border. Mexico lost and ceded control over what is now CA, NV, UT, AZ, and small western parts of NM and CO. The southern bits of AZ and NM were purchased from Mexico in 1853 under what is known as the Gadsden Purchase. Side point, in the treaty itself, Article X guaranteeing the protection of Mexican land grants was deleted by the US Senate.
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