George Washington (1732–99) was one of the Founding Fathers and the first President of the United States. He led the American forces to victory over the British during the Revolutionary War, presided over the 1787 Constitutional Convention that established the U.S. federal government, and is generally referred to as the "Father of His Country."

Thomas Jefferson (1743–1826) was one of the Founding Fathers and the third President of the United States. He advocated for democracy and individual rights, and he produced many of the documents that laid the foundation and set the standards for the United States at both the state and federal level.

Abraham Lincoln (1809–1865) served as the sixteenth President of the United States. He led the nation during the Civil War, abolished slavery, modernized the U.S. economy, and strengthened the federal government. He was assassinated in 1865.

Theodore "Teddy" Roosevelt (1858–1919) served as the twenty-sixth President of the United States. One of the leaders of the Progressive Era, his policies in office helped set standards for food and drugs sold in the United States, regulated big business, established the U.S. Forest Service, and designated the first National Parks. He is consistently ranked by historians as one of the top five American presidents.