Defining "influence" in the context of a presidency is multifaceted. It encompasses legislative achievements, judicial appointments, foreign policy successes, and the ability to rally public opinion. A president's influence can extend far beyond their time in office, shaping future generations through the precedents they set and the changes they enact.

Abraham Lincoln, often cited as the greatest American president, steered the nation through the Civil War, abolished slavery, and redefined the very meaning of liberty. His Gettysburg Address remains a cornerstone of American rhetoric, and his actions solidified the Union, preventing the country from fracturing irrevocably.

Franklin D. Roosevelt, facing the Great Depression and World War II, demonstrated unparalleled leadership in times of crisis. His New Deal programs fundamentally altered the relationship between the government and its citizens, establishing a social safety net that continues to this day. His wartime leadership solidified America's position as a global power.

George Washington, the first president, set the standard for the office, navigating the treacherous early years of the republic. His leadership during the Revolutionary War and his commitment to a peaceful transfer of power established critical precedents that shaped the nation's future.

Thomas Jefferson, the principal author of the Declaration of Independence, expanded the nation's territory with the Louisiana Purchase, doubling its size and opening vast new frontiers for exploration and settlement. His vision of an agrarian republic and emphasis on individual liberties profoundly influenced American political thought.

Theodore Roosevelt, a champion of conservation and a trust-buster, ushered in the Progressive Era, challenging corporate monopolies and advocating for the rights of the common man. His "Big Stick" diplomacy asserted American power on the world stage, particularly in Latin America.

Woodrow Wilson, leading the nation through World War I, played a key role in shaping the post-war world order. His vision for the League of Nations, though ultimately unsuccessful in securing American participation, laid the groundwork for future international cooperation.

Lyndon B. Johnson, despite the controversies surrounding the Vietnam War, pushed through landmark civil rights legislation, including the Civil Rights Act of 1964 and the Voting Rights Act of 1965, fundamentally altering the landscape of American race relations.

Ronald Reagan, a transformative figure in American politics, ushered in an era of conservative resurgence. His economic policies, known as "Reaganomics," and his staunch anti-communist stance had a lasting impact on both domestic and foreign policy.

Barack Obama, the first African American president, oversaw the passage of the Affordable Care Act, expanding healthcare access to millions of Americans. His election was a watershed moment in American history, symbolizing the progress made in race relations.

These ten presidents, while just a fraction of those who have held the office, represent a spectrum of leadership styles and accomplishments. Their decisions, both lauded and criticized, have shaped the nation we know today and continue to resonate through the halls of power and the lives of everyday citizens.