At the Constitutional Convention, the Delegates vote (YEA, 6; NAY, 5; ABSTAIN, 1) to provide for new States to be admitted into the Union on an equal footing with the original 13 States.
[added 11/29/2024]
Subsequent Events:
Authority:
Articles of Confederation, Article XIII
ccc-2point0.com/Articles-of-Confederation
References:
Avalon Project – Madison Debates – August 29
avalon.law.yale.edu/18th_century/debates_829.asp