How did world war i effect the economy of the united states?

When the war began, the U.S. economy was in recession. ... Entry into the war in 1917 unleashed massive U.S. federal spending which shifted national production from civilian to war goods. Between 1914 and 1918, some 3 million people were added to the military and half a million to the government.

Explanation:

The war ended on November 11, 1918, and America's economic boom quickly faded. Factories began to ramp down production lines in the summer of 1918, leading to job losses and fewer opportunities for returning soldiers. This led to a short recession in 1918–19, followed by a stronger one in 1920–21.

Explanation:

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i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.