Germany's inability to pay the reparations after WWI.
The Wall Street Crash of 1929.
The Young Plan of 1929-1930.
USA's decision to become isolationist.
Lack of world trade.
The USA demanded the money that they had loaned out to the European countries back.
It didn't, only the USA was affected by the Depression.
The Germans started to burn money, releasing smoke into the atmosphere and causing global warming to become a major issue.
The Depression caused more countries to trade with each other, causing international relations to improve tremendously.
The Depression forced countries to start overproducing goods.
Loan the USA money.
Make industries employ more workers in an attempt to produce more products and increase profit.
Charge high tariffs on imported products, causing international trade to decrease.
Request that Germany pay each country reparations individually in order to pay for the damages it caused during WWI.
Discourage nations from becoming too protective of their economies and encourage world trade.
Encourage printing more money.
Encourage nations to take products from Germany as repayment for the damages caused during WWI.
Follow the Laissez-Faire economic policy and let the industries and the economy rise on its own.
Increase the minimum wages of workers.