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The plural of 1780 is 1780s.
As in "this took place during the 1780s".
how did bans help spur economic growth in 1780s
1782 was in the 1780s.
The Electoral College was created in the 1780s at the Philadelphia Convention (a.k.a. Federal Convention, Constitutional Convention)
In the 1780s the publication of The Federalist Papers was intended to encourage ratification of the United States constitution.