The Spread of Revolution. The Latin American Wars of Independence, which took place during the late 18th and early 19th centuries, were deeply influenced by the American and French Revolutions and resulted in the creation of a number of independent countries in Latin America.
Mountains isolated the city-states Athens and Sparta. Those city states had different cultures and they were at war.
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Because of the 1830 turning point in religion
The economy in the United States in the 1920's varied greatly from European countries. After WWl, Europe struggled to rebuild. Europe had taken the brunt of the attacks and went into a deep depression. The United States in contrast boomed. The economy was better than ever before. Since no attacks had happened on American soil, we were able to mass produce consumer goods, etc. People were buying on credit, investing in the stock market, and moving to the city. Life was good in America; not so good in Europe.