At the Constitutional Convention, it is agreed that the Senate will be elected to six-year staggered terms, with one-third of the Senators elected every two years.
[restored 9/18/2021]
Subsequent Events:
Authority:
Articles of Confederation, Article XIII
ccc-2point0.com/Articles-of-Confederation
References:
Chronology of Events, 1774-1804,” from The Debate on the Constitution, two volumes, Bernard Bailyn, ed., (New York: Library of America, 1992), 2:1052.