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.
Under the Constitution, the president is the federal official primarily responsible for the relations of the United States with foreign nations. Presidents appoint ambassadors, ministers and consuls -- subject to confirmation by the Senate -- and receive foreign ambassadors and other public officials.mong the president's constitutional powers is that of appointing important public officials; presidential nomination of federal judges, including members of the Supreme Court, is subject to confirmation by the Senate.