I think it was because a bad winter in Russia
<span>The United States have had a trade deficit over the past two decades because the nation had a persistent trade deficit. Since the 1970s, The United States had entered into a trade deficit, from trade surplus. This started because Japan and Europe started trading and competing with US, in a range of industries.</span>
It would be the term "militarism" that refers to a nation's tendency to expand its armed forces and acquire new and better weapons, since in this case the nation in question is expanding its military capabilities.
It was the nineteenth amendment, it made equal voting rights for men and women
Although the United States was actively involved in World War I for only nineteen months, from April 1917 to November 1918, the mobilization of the economy was extraordinary. ... Over four millionAmericans served in the armed forces, and the U.S. economyturned out a vast supply of raw materials and munitions.