The influence of Both Democrate and Republican party acted like a pendulum that constantly change the dominant political view of American history. The Republican party was always known as the party that advocated less-government involvement, lower tax-rate, and strong miltary, while the democratic party was always known as the party that advocated more-government involvement, higher tax-rate, higher censorship, and higher government spending for welfares.
Because Barry Goldwater was opposed to the legislation promoted by Senator Lyndon B. Johnson in favor of African Americans, who decided to support the latter one in 1964 presidential election.
Answer: The Dred Scott decision basically said that slavery would be legal in all states of the Union. Living in a free state did not make a slave free. A Slave owner could bring his slaves with him into a free state that had voted to outlaw slavery.