A reason that millions of people left the Great Plains during the Great Depression was to find gold in California.
fertile farmland.
jobs as tenant farmers.
jobs to support their families.

to fight against injustice and class division

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.

a.) a poor farmer, due to the fact that they would want to be freed from british rule.

warfare was the primary means of cultural transmission in both regions.