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Theory (Ratzel's Organic Theory (Viewed states as similar to living…
Theory
Ratzel's Organic Theory
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Trained as a biologist, influenced by Darwin
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States obtain this living space, lebensraum, by annexing territory from weaker states. If a state stayed weak, other states that were stronger would seize its land.
A state has to grow, or it ceases to exist
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Heartland Theory
Created by British geographer, Sir Halford Mackinder (1861-1947)
Originally, people believed that power came from controlling water foutes in the ocean
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Rimland Theory
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Spykman thought these areas were more crucial to worldwide power because they had more varied resources than the heartland-including people and access to the sea
Sea Power Theory
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In other words, if you controlled the sea, you can control the world
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The Domino Theory
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America put into place the Truman Doctrine that stated we would protect countries attack by communist countries (ex: Korean War and Vietnam War)