The island where the signing of the agreement that established the Republic of Texas took place is Galveston Island, Texas. The Republic of Texas was declared on March 2, 1836, following a struggle for independence from Mexico. This declaration was formalized after the Battle of Gonzales and further solidified through the siege of the Alamo. The culmination of these events led Texas to become an independent republic until it later joined the United States in 1845. The unique historical and cultural identity of Texas can be traced back to its time as a republic.