ウィルモット条項はいつ締結され
After an earlier attempt to acquire Texas by treaty had failed to receive the necessary two-thirds approval of the Senate, the United States annexed the Republic of Texas by a joint resolution of Congress that required simply a majority vote in each house of Congress. President John Tyler signed the bill on March 1, 1845, a few days before his term ended. As many expected, the annexation led to war with Mexico. After the Capture of New Mexico and California in the first phases of the war, the political focus shifted to how much territory would be acquired from Mexico. The key to this was the determination of the future status of slavery in any new territory.
March 1, 1845