10. what was a result of the kansas-nebraska act? a. the addition of california to the nation as a slave state b. the falling apart of the whig party c. the falling apart of the democratic party d. the addition of missouri to the nation as a free state

The correct answer is B) The falling apart of the Whig Party.

Letter A cannot be correct, as California was added as a free state thanks to the Compromise of 1850.

Letter C cannot be correct, as the Democratic party still exists today and has not left the public eye since the early part of the 19th century.

Letter D cannot be correct because Missouri entered the Union as a slave state thanks to the Missouri Compromise of 1820.

This shows that only letter B can be correct.