when was texas annexed

Texas was annexed by the United States and admitted to the Union as the 28th state on December 29, 1845. The formal transfer of government took place later, on February 19, 1846. The annexation process involved a joint resolution passed by the U.S. Congress on March 1, 1845, and was finalized when President James K. Polk signed the joint resolution for the admission of Texas into the Union on December 29, 1845. Texas voters approved the annexation on October 13, 1845, and the Texas Constitutional Convention accepted the annexation proposal on July 4, 1845.