It’s set to the same melody as the British national anthem, God Save the King, and apparently also known as “America”.
I grew up in North Carolina and the only time I ever heard this song was in middle school chorus, and I couldn’t help but think it was just a shitty version of God Save the King.
Would you know this song? If so, did you learn it as “My Country Tis of Thee” or as “America”, and when/where did you grow up?
edit: Noticing a common trend that most people commenting who know it are from the midwest, perhaps it’s a regional thing?