Internationalism is a political principle that advocates greater political or economic cooperation among states and nations. It is associated with other political movements and ideologies, but can also reflect a doctrine, belief system, or movement in itself.
Supporters of internationalism are known as internationalists and generally believe that humans should unite across national, political, cultural, racial, or class boundaries to advance their common interests, or that governments should cooperate because their mutual long-term interests are of greater importance than their short-term disputes.
Internationalism has several interpretations and meanings, but is usually characterized by opposition to nationalism and isolationism; support for international institutions, such as the United Nations; and a cosmopolitan outlook that promotes and respects other cultures and customs.
The term is similar to, but distinct from, globalism and cosmopolitanism.
In 19th-century Great Britain, there was a liberal internationalist strand of political thought epitomized by Richard Cobden and John Bright. Cobden and Bright were against the protectionist Corn Laws and in a speech at Covent Garden on September 28, 1843, Cobden outlined his utopian brand of internationalism:
Free Trade! What is it? Why, breaking down the barriers that separate nations; those barriers behind which nestle the feelings of pride, revenge, hatred and jealously, which every now and then burst their bounds and deluge whole countries with blood.
Cobden believed that Free Trade would pacify the world by interdependence, an idea also expressed by Adam Smith in his The Wealth of Nations and common to many liberals of the time. A belief in the idea of the moral law and an inherent goodness in human nature also inspired their faith in internationalism.
Those liberal conceptions of internationalism were harshly criticized by socialists and radicals at the time, who pointed out the links between global economic competition and imperialism, and would identify this competition as being a root cause of world conflict.