A policy of non-participation in international economic and political relations

A Cold War alliance made between the nations of the US, Canada and Western Europe to defend one another if they were attacked by any other country.

A policy of making concessions to an aggressor in the hopes of avoiding war. Associated with Neville Chamberlain's policy of making concessions to Adolf Hitler.

A major change in European thought, starting in the mid-1500s, in which the study of the natural world began to be characterized by careful observation and the questioning of accepted beliefs.

American policy of resisting further expansion of communism around the world

The revolution that began in 1789, overthrew the absolute monarchy of the Bourbons and the system of aristocratic privileges, and ended with Napoleon's overthrow of the Directory and seizure of power in 1799.

A famine in 1845 when the main crop of Ireland, potatoes, was destroyed by disease. Irish farmers grew other food items, such as wheat and oats, but Great Britain required them to export those items to them, leaving nothing for the Irish to live on. As a result, over 1 million Irish died of starvation or disease, while millions of others migrated to the United States.

A political system headed by a dictator that calls for extreme nationalism and racism and no tolerance of opposition

an international organization formed in 1920 to promote cooperation and peace among nations