[since 1854]

The Mexican peso was the de facto currency of the United States for the first couple decades after the American Revolution.

[ARA]

What is your point other to point out a factoid? Who cares?

[Cvengr]

"The Mexican peso was the de facto currency of the United States for the first couple decades after the American Revolution."

Perhaps we're confusing which currency was used by which country. Mexico didn't exist until after 1811. For the first couple of decades after the Mexican American War, Mexico's defacto currency was the US Dollar because we basically floated their economy after the War.