<span>The Emergency Quota Act, also known as the Emergency Immigration Act of 1921,restricted immigration into the United States.</span>
Answer:
the start of the Industrial Revolution
Explanation:
By the time of the Industrial Revolution, there were more people than ever before. A main reason for this was 18th century agricultural improvements, which all but ended the periodic famines that had kept down European populations. From 1750 to 1850, the population of England alone nearly tripled.
During the First World War, the US became the largest supplier of food, manufactures and weapons to Europe. In this context, at the end of the war there was a relationship of dependence, where the US needed the market of Europe to dispose of its great production, and war-torn Europe depended on the American supply.
However, the European economy was devastated while the US was at its peak and created an overproduction that did not find enough consumer market, causing the economic crisis that would become the great depression.
