Why on earth did Japan attack the US Navy Base at Pearl Harbor?

When World War II erupted, what actions did the United States take in the late 1930s and early 1940s?

Name the presidents who have been assassinated while in office since the Civil War, in order.

While the 1970s certainly advanced civil rights causes in the United States, environmentally it was a disaster, as incidents like the Love Canal Catastrophe illustrate.  

Lectures noted that after World War II, racial segregation only existed in the south, not in the north. 

Since 1877, the social and/or political development of the United States has been shaped by what factors?

The Office of Price Administration (OPA) was in charge of controlling the price of gasoline in the 1980s.

You are genetic counselor, and a couple comes to you with concerns that if they have another child together it could have cystic fibrosis.  The man has cystic fibrosis, but the woman does not.  Genetic tests reveal that the woman is homozygous with respect to the gene involved in cystic fibrosis.  They have three children already, and none of their children has cystic fibrosis. Which of the following would be the most correct thing to tell them?

How does Laurene describe the symptoms she experiences during a sickle cell crisis?

According to the lectures, what event in the 1980s is credited with helping to end the Cold War by alerting leaders in the Soviet Union that a nuclear war was unwinnable?