Admission to the Union in the United States seems to be a vaguely laid out procedure as described in Article IV, Section 3, Clause 1 of the U.S. Constitution:
New States may be admitted by the Congress into this Union; but no new State shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the Junction of two or more States, or Parts of States, without the Consent of the Legislatures of the States concerned as well as of the Congress.
I could not find details on what the minimum vote threshold is needed in both houses to successfully send an Admission Resolution to the President's desk to sign. I have found an article on California's admission, but the votes tabulated there seem way beyond any minimum threshold.
What is the vote threshold in both houses of congress to send an Admission to the Union resolution to the President?