A SNP is a variation of a single nucleotide between individuals. These polymorphisms can therefore be used to discern small differences both within a population and among different populations.
President of the United States. The President of the United States is the head of state of the U.S., the chief executive of the federal government, and Commander-in-Chief of the armed forces. The United States was the first nation to create the office of President as the head of state in a modern republic.
The President of the United States of America is the head of state, and head of government of the United States. The office of President was created in the United States Constitution in 1788. The first President took office in 1789. The President serves as chief executive and is in charge of the executive branch of the United States government. The United States Constitution makes the President the Commander-in-Chief of the armed forces. It also lists powers given to the President.