OK is a word of indigenous origin (Choctaw)

The term OK has been internationalized and used worldwide and in different languages. 
The origin of the word has been attributed to a rather unusual ironic expression "oll korrect" or to a military expression "O killed". Much more likely is the hypothesis that establishes its origin in the language of the Choctaw nation which was the lingua franca language among the Indians and settlers of central and southern North America in the colonial period. In choctaw language "oke" means "it´s a deal". 
As usual the descendants of the invaders consciously or unconsciously rejected the indigenous roots of their idiomatic expressions. 
In other words the word OK is of Native American origin. 
It is worth it to open the curtains of occultation and cultural genocide of this continent. 
We include it as information in our book "Amerrique, the Orphans of Paradise". Following is a transcript of a site that raises the etymology of OK.
"The" Choctaw Dictionary of the Language "published in 1915 gives the first evidence of that.As a Christian missionary working with the Mississippi Choctaw, author Cyrus Byington cataloged the village language widely. Later, "Okeh" meant "it is like that and not otherwise." So the origin of the word is reduced to a Native American etymology. "