That statement is false
According to statistics, unemployment went from 14.3 % to 19 % during 1937. This cause the total manufacturing output in 1937 fell by 37 %
I think they took over 3 continents France, Switzerland, and Istanbul
When the British intercepted the Zimmerman telegram, they realized Germany was offering a diplomatic proposal for Mexico to become their ally during World War I in case the United States were ever to take up arms against the Germans. However, this outraged the American public including the president at the time which was Woodrow Wilson, and this led to speeding up of American armament and the declaration of war on Germany.