General Sam Houston
The Mexican War for Independence came first.
More laws changed in order to help the nation grow
Mexico/Spanish vs Texas (Texans)/United States
MEXICO
Both conflicts were in part due to an ideology known as Manifest Destiny.In the particular case of Texas vs. Mexico, slavery was the main reason of the Texas Revolution (1835-1836).See related questions.
Lawrence vs. Texas
Mexico
Mexico
Texas
Mexico didn't classify, as it had a horrible season: Mexico vs. Cuba: 4-0 Mexico vs. Haiti: 1-1 Mexico vs. El Salvador: 0-1 Mexico vs. Canada: 1-1 Mexico vs. Honduras: 0-0 At the end, Honduras and El Salvador classified and played on the '82 World Cup.
Texas
If you mean the Texas Republic, never.One of the causes of the Mexican-American War (1846-1848) was the admission of Texas as a U.S. state. At the end of such conflict, Mexico lost and was forced to cease any claim on Texas as long as it was part of the United States. Therefore, if Texas ever secedes from the U.S., Mexico is nominally entitled to renew its claims to such lost territory.Last time this could have happened, was during the American Civil War (1861-1865) when Texas split from the U.S. (as part of the Confederate United States). Mexico was however, embroiled on its own conflict against France, during the Second Franco-Mexican War (1862-1867). Mexico wasn't interested in Texas at the time, but its own survival as an independent country.