Aztec enemies allied themselves with Spanish invaders.
A direct primary is an election. In this election voters choose candidates directly to run on a party's ticket. There will then be an election for office.
Knowledge of the northern regions.
No and yes
There were two important supreme court ruling.
In the first ruling the native indians received a raw deal from the court as it ruled that they could hold land but they could not have title to that.
On second ruling, the court however ruled on their favor. The indian based their appeal on a ruling that forbid whites from occupying their land.
The ruling of self determination was however not enforced by President Jackton.