What are sentences that help build the maid idea called ?

Which phrase best describes roosevelt’s explanation of the german japanese war

The great depression, which lasted throughout the 1930s in the united states, affected many people, and it had a devastating impact on an entire subset of the u.s. population. modernist writer john steinbeck wrote about the toll the depression took on these families, many of whom were forced to leave their farms and find other sources of income.

Which statement is an historical example that supports her thesis statement?