Remember that when Germany offered to help Mexico retake Texas and several other bordering states in 1917, Mexico declined the offer not only because it couldn’t win militarily, but also because it determined that managing a large English-speaking population within its borders would have been very difficult for them.
Spaniards first colonized this area in the early 19th century before it broke away from Mexico in the middle of the century; however, by the early 20th century, several generations had passed since Texas officially joined the US, more than enough time for the area to become majority English speaking.
Texas was already majority-English speaking by the late 1820s, maybe 1830.
Only about 3,500 Spanish-speaking people lived in Texas when it was first organized as a Mexican State in 1821. The area was immediately favored as a destination for American (mostly Southern) freebooters, who quickly outnumbered the Spanish. This, along with Mexico's 1829 abolition of slavery, was the primary cause of the Texas Rebellion.
Really why there's a decent argument for the Mexican War being the worst war in American history--a war entirely for the purpose of expanding slave power.
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