As a result of economic developments in the United States during the late nineteenth century ?

As a result of economic developments in the United States during the late nineteenth century ?

A) there was less discrimination against immigrants by native-born Americans.

B) the United States became one of the major industrial countries of the world.

C) occupational and class mobility greatly increased.

D) most American workers enjoyed general prosperity.

answer : B) the United States became one of the major industrial countries of the world.