Understanding your blood oxygen levels when you are at rest is something that you need to do if you want to make the most of the oxygen that's entering your body. Normal blood oxygen levels for the average American is about 90 to 100 percent oxygen saturation.
Chief of State. Every nation has a chief of state, a person who serves as the symbolic leader of the country and represents the nation. In the United States, the president both leads the government and acts as the chief of state, although this is not the case in many countries.
Duties of the Secretary of State. Under the Constitution, the President of the United States determines U.S. foreign policy. The Secretary of State, appointed by the President with the advice and consent of the Senate, is the Presidentâs chief foreign affairs adviser. The Secretary carries out the Presidentâs foreign policies through the State Department and the Foreign Service of the United States. Created in 1789 by the Congress as the successor to the Department of Foreign Affairs, the Department of State is the senior executive Department of the U.S. Government. 1  The Secretary of Stateâs duties relating to foreign affairs have not changed significantly since then, but they have become far more complex as international commitments multiplied.