Is America a melting pot or a salad bowl?

Which of these can an adverbial clause modify?

In at least two paragraphs, discuss the differences between the principles of republicanism and democracy. explain whether you think the united states is more of a republic or a democracy. refer to at least one example from the constitution. (10 points)

According to the study what did john steinbeck do to prepare for his book the grapes of wrath