One factor that led to the fall of the roman empire was feudalism greek invasion in the pyrrhic war a lack of cultural unity the territory was too large to defend

The answer is The territory was to large to defend.

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.

answer is 1935

because gandhi led a march the sea in 1930 and 5 years later he did it again