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.
In addition, the president has the weighty role of commander in chief of the armed forces. As the nation's chief executive, the president oversees foreign policy, making treaties with foreign nations and appointing ambassadors to other nations and to the United Nations, and domestic policy, dealing with issues within the United States, and economic.