This passed as a joint resolution of the Congress of the United States.
Joint Resolution of the Congress of the United States, March 1, 1845
This was adopted by a convention of the government of the Republic of Texas.
Ordinance of the Convention of Texas, July 4, 1845
This passed as a final joint resolution of the Congress of the United States.
Joint Resolution of the Congress of the United States, December 29, 1845