The steam engine and the computer did not become major forces in society until:

A) they were mass-produced in the United States
B) they were invented
C) they were perfected
D) the Japanese mass-produced them
E) they were coupled with an urgent social need

Steam Engine

is a heat engine that performs mechanical work using steam as its working fluid, playing a pivotal role in the Industrial Revolution by powering factories, locomotives, and ships.

Major Forces

Fundamental or powerful factors that influence or shape the course of events in society, the economy, or the natural world.

Urgent Social Need

A critical and immediate requirement within a society that necessitates prompt action for the welfare of its members.