Terrorism, war, world markets, and security fall under American Foreign Policy, which uses force, threats of force, and diplomacy (sending an envoy

Terrorism, war, world markets, and security fall under American Foreign Policy, which uses force, threats of force, and diplomacy (sending an envoy to another country, also the oldest way of negotiating with another nation). American Foreign policy is quite complex, which is why military expenditures take up a majority of the budgeted expenses. What was introversion and extroversion as related to American foreign policy?