Most things are handled by the President and his Secretary of State.
Some things must be run by other parts of the government; for example, to make a treaty with a foreign country, the US Senate is required to vote on it, and two thirds of the Senators must vote yes for it to pass.
The Department of State is primarily responsible for matters of foreign policy in the United States.
The executive branch of the federal government of the United States of America has primary responsibility for conducting foreign affairs. The Department of State within that branch is the agency that carries out the foreign policy of the Executive branch.
The Department of State is the department in which all of the United States' ambassadors and foreign advisors serve.
Foreign relations are handled by the US Department of State ("State Department").
She is responsible for foreign policy, and is the head of the United States Department of State.
The President of the United States is primarily responsible for setting and executing foreign policy. The Secretary of State and other top officials assist in developing and implementing these policies, but the ultimate authority lies with the president.
Isolation
The U.S. Department of State is responsible for carrying out foreign affairs and diplomacy. It is tasked with developing and implementing the foreign policy of the United States, fostering diplomatic relations with other countries, and representing the United States in international organizations and negotiations.
The President of the United States is ultimately responsible for conducting foreign policy, but the Department of State, headed by the Secretary of State, has primary responsibility for foreign affairs/
to carry out the natiomn's foreign policy
containment
Helping other countries gives the United States influence over them