Who was the first President of the United States?

The first President of the United States was George Washington, which makes this answer correct. Washington took office on April 30, 1789, after the United States won its independence and established itself as a new nation. His leadership during the American Revolutionary War and his role in the drafting of the Constitution solidified his position as a key figure in American history. He set many precedents for the presidency, including the tradition of a two-term limit and the formation of a Cabinet, which are still significant in today's political structure.

Understanding the significance of Washington's presidency is vital, as he is often referred to as the "Father of His Country" for his indispensable contributions to the founding of the United States. Other figures in the choices, like John Adams, Thomas Jefferson, and Abraham Lincoln, were indeed notable presidents who had profound impacts on the nation, but they served after Washington and contributed to the development of the country in different eras and contexts.