Federalism contributes to economic and political differences among the states because it

it permits each state freedom.

Explanation:

The term federalism itself defines a type of government in which there is sharing of power at two levels of government each enjoying equal status. Each state enjoys sovereignty at the local level and it sometimes leads to political and economic differences because it permits each state freedom. each state develops a unique identity and holds itself above others.

the answer is a) to be able to obey them.

hello!

according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

hope this