Who was involved in Texas

who owned it:

Although Mexico's war of independence pushed out Spain in 1821, Texas did not remain a Mexican possession for long. It became its own country, called the Republic of Texas, from 1836 until it agreed to join the United States in 1845.

Who was involved in the Texas Revolution:

Texas Revolution, also called War of Texas Independence, War fought from October 1835 to April 1836 between Mexico and Texas colonists that resulted in Texas's independence from Mexico and the founding of the Republic of Texas (1836–45

a change of venue is the legal term for moving a trial to a new location. a change of venue request because venue is improper means that the removing defendant believes that the case may not be in that venue because it is improper under procedural rules.