You are very close in your thinking about George Washington, but it's important to know that he was just one of many people involved in the founding of the United States. The colonies that eventually became the United States were founded by different groups of people, including the Pilgrims and the Puritans who came to America for religious freedom.
Additionally, many European countries like England, France, and Spain played important roles in establishing these colonies. There were also Native American tribes who had been living on the land for thousands of years and had their own rich cultures and histories long before the Europeans arrived.
Furthermore, during the time of the American Revolution, many other leaders besides George Washington helped shape the country, such as Thomas Jefferson, Benjamin Franklin, and John Adams. They worked together with many ordinary people who believed in the idea of freedom and independence. So, while George Washington was a key figure and the first president, he was just part of a larger group of people who helped build the United States.