Who was the first President of the United States?

George Washington was the first President of the United States, serving from 1789 to 1797. He is often referred to as the "Father of His Country" due to his pivotal role in the founding of the nation and his leadership during the American Revolutionary War. Washington's presidency set the precedent for future leaders and established protocols for the federal government. His leadership helped to unify the country during its formative years and set a standard for the office of the presidency that persists today.

In the context of the other figures mentioned, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt were all significant presidents in their own right, known for their contributions and leadership during critical periods in American history, but they were not the first to hold the office.