Intervention: involvement by a foreign power in the affairs of another nation, typically to achieve the stronger power's aims
Sphere of Influence: an area or region over which a country has significant cultural, economic, military, or political influence
Isolationism: policy of refraining from involvement in global affairs
Expansionism: policy of growing a nation's physical territory or political influence
Imperialism: policy of creating colonies in weaker nations in order to generate raw materials and have access to new markets
Turner's Thesis: An idea advanced by historian Frederick Jackson Turner that argued that Americans should seek a new frontier, one in foreign lands; because this would help Americans maintain their inventive and energetic spirits
Big Stick Policy: foreign policy under Theodore Roosevelt that used U.S. power to police foreign nations, particularly those in Latin America
Roosevelt Corollary: policy put forth by Roosevelt stating the United States would intervene in Latin America on behalf of foreign powers if Latin American nations did not meet their agreements
Dollar diplomacy: foreign policy under William Howard Taft that used U.S. economic power to try to shape international affairs
Natural resources: materials such as oil, natural gas, lumber, gold, copper, waterways, and fertile soil that are native to a given place and can be used for economic benefits
Markets: places where manufactured goods can be bought and sold
Notes:
Alaska
Secretary of State William H. Seward signed the treaty to purchase Alaska from Russia for $7.2 million in 1867. Many Americans thought buying Alaska was a mistake. Alaska was barren and covered with ice. They called it names such as "Seward's Folly" and the "Polar Garden." The Russians agreed. They had decided to sell Alaska because they did