Economic interventionism is any activity, beyond the basic regulation of fraud, undertaken by a central government in an effort to affect a country's economy.
Historical examples of supporters of non-interventionism are US Presidents George Washington and Thomas Jefferson, who both favored nonintervention in European Wars while maintaining free trade.
A group of Senators known as the Irreconcilables, identifying with both William Borah and Henry Cabot Lodge, had great objections regarding the clauses of the treaty which compelled America to come to the defense of other nations.
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In 1823, President James Monroe articulated what would come to be known as the Monroe Doctrine, which some have interpreted as non-interventionist in intent: "In the wars of the European powers, in matters relating to themselves, we have never taken part, nor does it comport with our policy, so to do. It is only when our rights are invaded, or seriously menaced that we resent injuries, or make preparations for our defense."
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Former Republican Congressman Ron Paul favored a return to the non-interventionist policies of Thomas Jefferson and frequently opposed military intervention in countries like Iran and Iraq.
The Ludlow Amendment, introduced several times to the House of Representatives by Louis Ludlow of Indiana between 1935 and 1940 during an era of heightened isolationist tendencies, proposed an amendment to the Constitution that would require a national referendum to declare war, except in the case of invasion and attack.
In 1950 Brecht removed Lindbergh's name for a production by the Südwestrundfunk, adding a preface denouncing Lindbergh's contributions to the technology of terror bombing as well as his wartime anti-interventionism and alleged Nazi sympathies.