What ecological factor made agriculture difficult on the Great Plains in the 1930s?
A. wild plains grasses B. insuffient rainfall
C. muddy conditions

B. Insufficient rainfall.

Explanation:

The great plains typically has a very dry climate, which make it hard for the area to retain water source.  This make it hard for plants to survive.

Farmers in these area can't do anything else beside relying on rainfall in order to maintain their agricultural production. During the 1930s, very little rainfall pour down in this area, causing massive agricultural failures in this period.

states

explanation:

as the old saying goes, all politics are local. state and federal governments affect our daily lives in numerous ways. yet, in our federal system, there is supposed to be a balance between federal and state power. as james madison envisioned it in federalist no. 51, “the power surrendered by the people” would be “divided between two distinct governments,” creating a balance of power that would enable the “different governments [to] control each other.”