How did the change in the Spanish policy affect American farmers in the west

Their goods traveled down the Mississippi to New Orleans where workers loaded crops onto other ships bound for markets to trade which was very important. How did the change in the Spanish policy affect American farmers in the west? ... It gave inexpensive land and U.S. control over the Mississippi River.

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the three answers (for plato at least) are:

b-condemned sola fida 

d-set rules for establishing seminaries and for educating clerics in the seminaries 

f-recommended moderation in the sale of indulgences and banned the sale of false indulgences 

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation: