Read the research topic.
Jazz in the 1930s and its impacts
Which research question is most effective for this topic?
How did jazz develop in the 1930s?
Why was jazz music popular in the 1930s?
Who were popular jazz musicians and bands of the 1930s?
How has music changed over time as a result of jazz in the 1930s?

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

explanation:

nutelal

during world war ii                                                      

the romans were initially interested in expansion via sicily (which at that time was a cultural melting pot), part of which lay under carthaginian control. at the start of the first punic war (264-241 bc), carthage was the dominant power of the western mediterranean, with an extensive maritime empire