The song title, of course, is a critique or commentary on America and its relationship with Black folks. The substitution of a “k” for the “c” (often spelled “Amerikkka”) is a long tradition among black Americans critical of the nation.
Ice Cube, 2pac, TI, and others have used the critical misspelling.

He also uses the least amount of “c’s” possible due to his Blood affiliation, especially on his Twitter.
As a Blood, it is seen as a disrespect to use C’s in written language (due to the rivalry with the Crips).