Which two groups cooperated with the government to switch from peace time to war time production
a. state government and armed forces
b. labor and business
c. the allies and axis powers
d. the president and congress

The correct answer is option B. "labor and business". Historically labor and business had been two groups that had cooperated with the government during war times. During World War II the president of USA gave these two groups the term of "E-for-excellence" for their cooperation. The efforts of labor and business included waige and price control, labor of women and creation of jobs.

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when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.