Which of the following conflicts led to an expansion of Presidential foreign policy power? 1)World War I
2)World War II
3)Vietnam
4)None of these choices are correct.

The foreign policy of the United States is its interactions with foreign nations and how it sets standards of interaction for its organizations, corporations and system citizens of the United States.

The officially stated goals of the foreign policy of the United States of America, including all the Bureaus and Offices in the United States Department of State,[1] as mentioned in the Foreign Policy Agenda of the Department of State, are "to build and sustain a more democratic, secure, and prosperous world for the benefit of the American people and the international community".[2] In addition, the United States House Committee on Foreign Affairs states