According to Murray Rothbard’s article today: nothing.
Q: What are the basic elements of a proper libertarian foreign policy?
A: Well, the basic elements of any libertarian foreign policy is to pressure the government to do nothing abroad, just to pack up shop and go home. General Smeadly Butler, one of my great heroes, formerly of the Marine Corps, in the late 1930s proposed a constitutional amendment in The Woman’s Home Companion. His article was a sensation for awhile but, of course, the amendment never was adopted and has now been forgotten. But it was kind of a charming constitutional amendment — I recommend that everybody read it. In essence it says something like this: No American soldier, plane, or ship shall be sent any place outside America. In other words, complete abstinence from any kind of American military intervention and political and economic intervention.
