While each of the answers is a real voter suppression tactic, threats of violence were performed on local community scales, as opposed to legal tactics enacted by municipal and state governments. 

The various boundaries of the United States' congressional districts within each state are generally determined by the State Legislatures of those states. 

An open-seat election occurs when an incumbent either dies or retires during office, leaving a seat completely vacant. This is particularly important, because in a standard election incumbent candidates win a large majority of the time, so an open-seat provides an opportunity to multiple people, who might otherwise have no chance of being elected.

The correct answer is "States moving their primaries earlier and earlier to have more influence on the outcome." States who have earlier primaries have more influence over the outcome of the nomination process. Because of this, states have moved their dates earlier and earlier in the calendar year, in a process known as frontloading.”

The Presidential election of 1968 was the last election in which a third-party candidate from outside the Democrat-Republican bloc was able to carry at least one state in an election. The independent candidate, George Wallace, won five Southern states by campaigning in favor of the continuation of segregation. The election is also considered an important realignment election, as much of the New Deal bloc of voters migrated towards Richard Nixon’s promise to “restore law and order.”

The election of 1928 was won in a landslide by the Republican candidate, Herbert Hoover. He ran on the platform of opposition to prohibition and promising to maintain a strong economy. The booming 20s, as they are now often called, was a time of great economic growth and was firmly associated with the Republican Party; however, less than a year into Hoover’s Presidency the Great Depression broke out and he was voted out of office in the election of 1932 as emphatically as he was elected in 1928.

The general public only “directly” elects representative to the Senate and to the House. Supreme Court Justices are appointed by the President and approved by Congress. The President and Vice-President are voted for by the general public, but in an election the public is actually voting for electors who, through the electoral college, vote for the President and Vice-President. They key word of the question is "directly."

Incumbents (politicians who already hold the position for which they are running) win the vast majority of congressional elections. In some election cycles, the figure has been as high as ninety-percent.

All of these statements are true except that younger people are more likely to vote than older people. Young people, those in their twenties in particular, are notoriously difficult to get to the polls whereas older people tend to turn out in overwhelming numbers.

A caucus is the name given to the meeting of local members of a political party to decide the platform and issues of that political party and to select candidates for election. Caucuses were more prominent in the early part of the twentieth century than they are today, but they are still part of the electoral process in places like Iowa.