Texas<span> annexation. The </span>Texas<span> annexation was the 1845 incorporation of the Republic of </span>Texas<span> into the </span>United States<span> of </span>America<span>, which was admitted to the Union as the 28th state on December 29, 1845. The Republic of </span>Texas<span> declared independence from the Republic of Mexico on March 2, 1836.</span>
