The main concept here is naming the term used for a period when the economy slows down. An economic downturn is called a recession. It refers to a stretch of time when overall economic activity declines, often visible through falling GDP, reduced hiring, lower spending, and weaker production. In many contexts, a recession is described using criteria like two consecutive quarters of shrinking GDP, though economists may look at a broader mix of indicators to confirm the downturn. The other options don’t fit because they describe different ideas: Pearl Harbor is a historical military attack, propaganda is biased information used to influence opinions, and reconstruction means rebuilding after damage. So the term that captures a downturn in economic activity is recession.

Expansionism refers to extending a nation's power by acquiring new territory. This idea links national strength directly to land and influence, often through annexation, colonization, or conquest to gain strategic positions, resources, or greater sway over regions. The other terms don’t fit as well: isolationism is about staying out of international conflicts, globalization means increasing global interconnectedness and exchange, and militarism emphasizes military buildup and use of force as a policy tool—but not necessarily land expansion. Expansionism best captures the concept of growing power through territorial acquisition.

Democracy is the system in which people elect leaders to govern on their behalf. Through elections, citizens choose representatives who make laws and run the government, with accountability to the people. This setup ensures political power comes from the governed and can be removed at elections. A dictatorship describes rule by a single leader or small group without such elections. A domino effect is a chain reaction, not a government form, and the Dust Bowl was an environmental disaster, not a political system.

Focusing on how news outlets used dramatic, exaggerated reporting to shape how people thought, this practice is yellow journalism. In the late 19th century, newspapers competed for readers with bold headlines and sensational, sometimes inflated stories. The aim was not just to inform but to influence public opinion and spark action, contributing to public attitudes about events like Cuba and the Spanish-American War. The other options refer to unrelated topics: westward expansion is about territorial growth, victory gardens were a WWII home-front program, and the Vietnam War denotes a specific conflict.