Posted under Sovereignty and Secession
What DeLay’s referring to is the Joint Resolution for Annexing Texas to the United States (1845):
Resolved by the Senate and House of Representatives of the United States of America in Congress assembled, That Congress doth consent that the territory properly included within, and rightfully belonging to the Republic of Texas, may be erected into a new state, to be called the state of Texas, with a republican form of government, to be adopted by the people of said republic, by deputies in Convention assembled, with the consent of the existing government, in order that the same may be admitted as one of the states of this Union.
New states, of convenient size, not exceeding four in number, in addition to said state of Texas, and having sufficient population, may hereafter, by the consent of said state, be formed out of the territory thereof, which shall be entitled to admission under the provisions of the federal constitution.
Be it resolved, that a state, to be formed out of the present Republic of Texas, with suitable extent and boundaries, and with two representatives in Congress, until the next apportionment of representation, shall be admitted into the Union, by virtue of this act, on an equal footing with the existing states, as soon as the terms and conditions of such admission