all of these
Mexico, which is another country.
Texas & New Mexico.
Texas was originally part of Mexico until it gained independence in 1836. Following the Texas Revolution, the Republic of Texas existed until it was annexed by the United States in 1845. The subsequent Mexican-American War (1846-1848) led to the Treaty of Guadalupe Hidalgo, which established the current borders, with Texas becoming a U.S. state. Today, Texas is fully part of the United States, and no part of it belongs to Mexico.
Texas belonged to Mexico from 1821 to 1836. When Mexico won it's independence in 1821, it included Texas as part of its nation. Texas won its independence from Mexico in 1836 and remained independent until its annexation into the US in 1845.
First it was part of Mexico, the revolted and was it's own country for about nine or ten years then in 1845 Texas was annexed into the United States
Texas never moved, I believe the Question is "To which Nation was Texas a part before it became part of the U.S." that answer would be Mexico
Can you divorce in Texas today and get married to someone else in New Mexico the next day?
To summarize, California, Nevada, Utah, Texas and parts of Colorado, Arizona, New Mexico, and Wyoming were part of Mexico and now belong to the US.
New Mexico is west of Texas, but, Mexico is south of Texas.
No US state has ever been under "rule of Mexico".However, the territory occupied by the states of Texas, New Mexico, Arizona, California, Nevada, and Utah and parts of Oklahoma, Colorado, and Wyoming was at one time claimed by Mexico.
Texas used to belong to Mexico. When Texas gained independence from Mexico, it became its own country, essentially. Texas wanted to become a part of the United States, but Mexico was opposed because: (a) Mexico knew that it had a better chance of reclaiming Texas if it only had to fight a Texas military as opposed to a U.S. military. (b) Mexico was very opposed to slavery. If Texas was going to be annexed, the U.S. would make it a slave state, meaning slavery could exist in Texas, which Mexico didn't like.