The 100th anniversary of Texas statehood was commemorated by a 3-cent blue stamp issued on December 29, 1945. The Republic of Texas was established in 1836 in the aftermath of a rebellion against Mexican authority. Texas sought annexation to the United States, but this was resisted by Northerners opposed to the expansion of slavery. However, on December 29, 1845, Texas was annexed as a slave state. This led directly to the Mexican-American War as Mexico moved to protect its far western territories from American expansion.