The Missouri Compromise allowed Missouri, settled mostly by Southerners, to enter the Union as a slave state, but made it the most northern state to allow slavery by creating a line at the 36°30′ north parallel. Every territory entering as a state north of that line would enter as a free state, while a territory entering as a new state south of the line could be a slave state.

The prohibition of alcohol caused a great deal of social problems in 1920s America. It directly led to the growth of the American mafia and organized crime in general. It caused people to attempt to distill their own alcohol at home, a practice that could be dangerous to undertake and also poisonous to drink. Furthermore, the economy was struggling and the repeal of prohibition was seen as  a small measure that could help the economy and alleviate the difficulty of daily life. Finally, it ideologically turned ordinary Americans into criminals. The correct answer is that Protestant leaders did not begin to speak in less condemning tones about alcohol; rather, the majority of people just were not listening.

Prior to Sherman’s famous “March to the Sea," in which he defeated the Confederates in Atlanta and Savannah, crippling the Southern war effort, popular support for Lincoln was waning heavily. Many voters in the North felt that the Civil War could not be won or that Lincoln’s lack of military knowledge was hindering the war effort. In the months leading up to the election the Democratic candidate General George McClellan was seen as the ideal replacement. However, Sherman’s victories provided a greater degree of legitimacy to Lincoln’s administration and campaign, and he was helped along to a somewhat unexpected victory. 

The election of 1960 was the first election to have televised debates. At this time, over eighty percent of Americans owned a television, and a massive proportion of the population tuned in to watch the debates. Kennedy—tall, confident, and expressive—came across very favorably in comparison to Nixon, who had refused makeup and failed to grasp the significance of the occasion. Prior to the debates, most polls had Kennedy trailing Nixon slightly.

The Watergate scandal refers to Richard Nixon’s attempts to spy on and quiet Democrats and anti-war protestors. The event caused massive disdain among the American population for politicians, and the eventual resignation of President Nixon following the release of the tapes. When Ford came into office he pardoned Nixon and immediately lost credibility. It also directly caused two other major changes. The National Bar Association strengthened its code of conduct, as many of the men incriminated had been lawyers. Watergate also encouraged the American media to engage in aggressive investigative practices. 

In 1906, Upton Sinclair wrote The Jungle to expose the plight of immigrants; however, most Americans were instead struck by the unsanitary conditions in which their food was made and processed. In response, the Pure Food and Drug Act was passed to ensure cleaner and healthier conditions for food processing.

Theodore Roosevelt had made a promise to the country to not seek reelection in 1908, and handpicked his Secretary of State, William Howard Taft, as his successor. During Taft's term in office, however, many of Roosevelt's progressive policy goals were reversed by Taft, who had joined with the conservative wing of the Republican Party. Roosevelt challenged Taft for the Republican Nomination in 1912 to return the party to his brand of progressivism, and created the Progressive Party (also known as the Bull Moose Party) when he was denied the Republican nomination. The split Republican Party allowed another Progressive, Democrat Woodrow Wilson, to win the Presidency.

In response to widespread public outrage after abhorrent factory conditions were exposed in Sinclair's book, Roosevelt passed the 1906 Pure Food and Drugs Act, which established the FDA.

The Sedition Act of 1918 (technically a series of amendments to a previous act) was a very vague law. It forbade “disloyal, profane, scurrilous, or abusive language” against the US, the flag, or the military. Clearly, this language covers quite a lot, and can be stretched even further. This is, of course, a good example of what often happens in wartime—civil liberties get drastically reduced in name of necessity. Here, the law clearly encroaches on free speech.

Although this had the potential to be a difficult question, the answer choices should have narrowed it down considerably for you. In fact, only two of the answer choices are legal maxims used in a case (the other two are just platitudes). The correct answer is yelling “fire” in a crowded theater—the analogy that Justice Holmes used to support his legal conclusion that, when there is a “clear and present” danger, liberties may be restricted.