who is the person whose name appears in the treaty you just mentioned?
John Tyler - a  U.S. President from 1841 to 1845
Texas annexation
In 1843, U.S. President John Tyler, then unaligned with any political party, decided independently to pursue the annexation of Texas in a bid to gain a base of popular support for another four years in office. 
when was texas admitted to the united states December 29, 1845. which country was it a part of before getting annexed by the u.s? Mexico how did this issue affect the u.s presidential election of 1844? The Tyler-Texas treaty, signed on April 12, 1844, was framed to induct Texas into the Union as a territory, following constitutional protocols. To wit, Texas would cede all its public lands to the United States, and the federal government would assume all its bonded debt, up to $10 million.
wiki:13288242
Texas annexation [SEP] Introduction
Moreover, they wished to avoid a war with Mexico, whose government refused to acknowledge the sovereignty of its rebellious northern province. With Texas's economic fortunes declining by the early 1840s, the President of the Texas Republic, Sam Houston, arranged talks with Mexico to explore the possibility of securing official recognition of independence, with the United Kingdom mediating. In 1843, U.S. President John Tyler, then unaligned with any political party, decided independently to pursue the annexation of Texas in a bid to gain a base of popular support for another four years in office. His official motivation was to outmaneuver suspected diplomatic efforts by the British government for emancipation of slaves in Texas, which would undermine slavery in the United States.