What did the United States know about the Holocaust and how did it respond?

America's traditional policy of open immigration had ended when Congress enacted restrictive immigration quotas in 1921 and 1924. The quota system allowed only 25,957 Germans to enter the country every year. After the stock market crash of 1929, rising unemployment caused restrictionist sentiment to grow, and President Herbert Hoover ordered vigorous enforcement of visa regulations. The new policy significantly reduced immigration; in 1932 the United States issued only 35,576 immigration visas.