In the united states, the decade of the 1920's was characterized by:
a. a willingness to encourage immigration to the united states
b. increased consumer borrowing and spending
c. the active involvement of the united states in european affairs
d. major reforms in national labor laws

b. Increased consumer borrowing and spending.

Explanation:

The period of the 1920s is the period of economic, social and cultural growth of the American society. The period is named as Roaring twenties or Golden twenties for the progress Americans enjoyed during this time. After world war one America emerged to dominate world finance. Women got the right to vote, in metropolitan cities new culture developed for example Jazz, Art Deco reached new heights, the steady economy of the country led to mass consumerism.

a system of cooperative federalism emerged, as the powers of the federal government expanded.