What happened in 1821 that encouraged the further development of western trade routes, some of which crossed the oklahoma territory?

The other person was wrong. The correct answer is actually  

B. Mexico achieved independence from Spain.

The trail of happened years later after this event.

this question makes no sense dude

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.