Direct Democracy refers to a system of government in which citizens directly vote on issues and the majority prevails. This is impractical on a national level, where there are millions of would-be voters, so a representative democracy, or a republic, is established where representatives are elected to "represent" the voting interests of the people.

While many Constitutionally-related changes have occurred over the span of American history, the most widespread and vital transformation has been the various expansions of democracy that have taken place. The abolition of slavery, suffrage for both African Americans and women, the lowering of the national voting age (to eighteen), the passage of civil rights legislation, and the direct election of Senators are just some of the most crucial ways in which more and more American citizens have gained increased democratic rights, influences, and freedoms. This Together with the nation and its people, the Constitution has continually evolved along these lines, often through the passage of relevant amendments (such as the Fifteenth Amendment which banned racial discrimination and the Nineteenth Amendment’s grant of voting rights to women). Further democratic expansions and changes are sure to come.

Pluralism often describes modern American society, especially since the 1960s. Pluralism is used in discussions of politics to refer to a society in which many different groups with many different opinions and viewpoints all have to coexist and work with each other in the political sphere. This stands in stark contrast to the popular view in the early twentieth century which held that whatever the majority of people believed should govern society.

The 13th Amendment to the United States Constitution states, "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction." Therefore, the 13th Amendment is the correct answer.

A concurrent power is a power shared equally by both the state and Federal governments. Concurrent powers in the Constitution are the enforcement of laws, ability to levy taxes or borrow money, spend for the promotion of general welfare, and the ability to establish courts. Immigration is regulated by the national government.

Elite and Class Theory is a theory that attempts to explain part of modern American politics. The theory suggests that the wealthy members of American society hold a degree of power that is heavily disproportionate, and which supersedes any real participation in the American democratic process. Essentially it argues that through corporate interest groups, influence over the media, sponsored think-tanks, and campaign financing the economic elite can control the entirety of the democratic process.