Please help asap! Why wasn't the Missouri compromise of 1820 enough to end tension between the north and south by the 1840s?

a. All of Texas would be a slave state, which went against the Missouri compromise.
b. Some new territories went both above and below the line of compromise.
c. Mexico had outlawed slavery, so the new land gained from them could not allow slavery.
d. The North and South continued to fight over territory by the Rio Grande.

President nixon resigned from office in 1974 after he was informed that the senate would impeach him, as allowed in the constitution, for his actions in the watergate scandal. one of the key reasons that nixon’s actions became public was a) the freedom of press guaranteed by the first amendment. b) the right to confront witnesses as guaranteed by the sixth amendment. c) the limitation of judicial powers as defined in article 3 of the constitution. d) the prohibition against illegal search and seizure as guaranteed by the fourth amendment.