It all went down in Frisco, Texas -- where the U.S. women's soccer squad beat Canada, 2-0 ... and then hit the locker room for some post-game booze and partying.

Alex Morgan led the fiesta with flutes of champagne while P!nk's "Raise Your Glass" fittingly played.

Emily Sonnett hit a little nae nae ... Kelley O'Hara got in some twerking ... and Mallory Pugh gave some fist pumps while chowing down on a sandwich. Good times were had by all.

As for Alex ... glad to see her Disney World drama ain't slowing down her party roll.

Congrats!