Way down yonder in the Indian nation
I rode my pony on the reservation
In the Oklahoma Hills where I was born...

Big continent and eleven centuries of Euros, counting from the Pagan & Roman Catholic Norse. First Euro-Protestant anywhere was the 1517 German model. The colonials were already at 20+ human generations, and counting.

“Six Flags,” mostly open borders & frontiers:
Conquistadors c.1500
French Texas 1684–1689
Spanish Texas 1690–1821
Mexican Texas 1821–1836
Rep. of Texas 1836–1845
U.S. Statehood 1845–1860
Confederacy    1861–1865

Oklahoma:
Indian Territory 1834–1907
U.S. Territory   1890–1907
U.S. Statehood   1907

Those exquisitely Catholic Inquisitions formally ended with the Mexican Era; full separation of Church from State not until 1836. Both institutions might as well have come from the planet Neptune where Native American Pagans were concerned.

Bringing it back to music:
fwiw: For you shanty fans, that's also the end of institutional Catholic work psalmody worldwide (celeusma, saloma, salomar, chiourme &c) in the various armies, navies, prisons and labour camps.

Fwiw II: The end of the sovereign American Indian Territories brought out the Indian Intermezzo and Indianist movement in the Yank pop and classical music genre.