テキサス併合
On June 8, 1844, after fierce partisan struggles, the Senate rejected the Tyler–Texas treaty by a vote of 35–16, a margin of more than two-to-one. The vote went largely along party lines: Whigs had opposed it almost unanimously (1–27), while Democrats split, but voted largely in favor (15–8). Nevertheless, the disclosure of the treaty placed the issue of Texas annexation at the center of the 1844 general election.