Imperialism - Domination or control, by one country, of one or more other countries or territories
Inflation - Popularly, a rise in prices of goods and services; in economics, monetary expansion
Intellectual property laws - Laws that grant monopoly rights on intellectual creations, such as patents and copyrights
Iraq War - Invasion of Iraq by the U.S. and other countries, purportedly to find weapons of mass destruction
Other Topics
Individualism - Belief system that holds that each individual is more important than groups of people, leading to individual rights and particularly to private property rights