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VOICE OVER: Peter DeGiglio
These US leaders altered the course of history in major ways. Welcome to WatchMojo, and today we're counting down the American presidents who, for better or for worse, changed history the most. Our countdown of US Presidents who changed the course of history includes Harry S. Truman, John F. Kennedy, Abraham Lincoln, and more!

#10: Harry S. Truman

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The 33rd President significantly altered the course of American and global history. Ascending to the presidency in 1945 after Franklin D. Roosevelt's death, Truman's decision to use atomic bombs against Japan hastened the end of World War II and inaugurated the nuclear age. He implemented the Marshall Plan, revitalizing war-torn Europe and containing communism, and established the Truman Doctrine, foundational to Cold War policy. Domestically, Truman desegregated the armed forces, setting a precedent for civil rights advancements. His leadership during pivotal moments, including the Korean War and the recognition of Israel, underscored his lasting impact on U.S. foreign policy and societal progress.

#9: Woodrow Wilson

Serving from 1913 to 1921, Wilson’s tenure was marked by significant domestic reforms known as the New Freedom, which included the establishment of the Federal Reserve System and the Federal Trade Commission, aimed at increasing economic oversight and fairness. Wilson's leadership during World War I and his subsequent push for the League of Nations reshaped international relations, promoting the idea of collective security and diplomacy over warfare. Though the U.S. Senate did not ratify the Treaty of Versailles and the U.S. never joined the League, Wilson's vision laid the groundwork for the future United Nations. His advocacy for self-determination and new international order marked a decisive shift in U.S. foreign policy, despite his controversial legacy on domestic civil liberties and racial segregation.

#8: Ronald Reagan

This president’s economic policies, known as "Reaganomics," were aimed at reducing the size of government, cutting taxes, and deregulating industries, which proponents credit with stimulating economic growth and ending the stagflation of the 1970s. Reagan's aggressive stance against the Soviet Union, epitomized by his call to "tear down this wall" in Berlin, and his strategic defense initiatives played a key role in ending the Cold War. His administration's emphasis on conservative social values and a strong national defense shifted the political landscape in the U.S., reviving American patriotism and influencing the global balance of power. Reagan's legacy is marked by his charismatic leadership, promotion of free-market policies, and contributions to the dissolution of the Soviet Union, making him a transformative figure in late 20th-century history.

#7: Lyndon B. Johnson

The acerbic Johnson served from 1963 to 1969 and fundamentally transformed American society through his domestic policies. His vision of a "Great Society" led to landmark legislation such as the Civil Rights Act of 1964, which outlawed discrimination based on race, color, religion, sex, or national origin, and the Voting Rights Act of 1965, which prohibited racial discrimination in voting. Johnson's administration also created Medicare and Medicaid, significantly expanding healthcare access, and passed environmental protection laws and education funding support. However, his presidency was deeply marred by the escalation of the Vietnam War, which significantly eroded his popularity and overshadowed his domestic achievements.

#6: Theodore Roosevelt

This renowned figure in American history was known for his exuberant personality and versatile policies that forever changed the nation's direction. He was a driving force behind the Progressive Movement, advocating for the conservation of natural resources, which led to the establishment of numerous national parks and forests. Roosevelt's commitment to the "Square Deal" domestic policies promoted fairness for workers, consumers, and businesses, laying the groundwork for modern consumer protection and labor rights. Internationally, he was instrumental in negotiating the end of the Russo-Japanese War, for which he won the Nobel Peace Prize, and he played a key role in the construction of the Panama Canal, expanding America's naval power and influence.

#5: James Madison

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The 4th President of the United States played a crucial role in shaping the nation's early years. Known as the "Father of the Constitution," his contributions to the drafting of the Constitution and the Federalist Papers were pivotal in defining the framework of American democracy. Madison's time at the top was marked by the War of 1812 against Britain, often called America's "Second War of Independence," which challenged the young nation's sovereignty and resilience. His leadership during the war, despite initial unpreparedness and setbacks, eventually led to a sense of national pride and unity. Madison also oversaw the admission of new states to the Union and the establishment of the Second Bank of the United States, reflecting his evolving views on federal power.

#4: John F. Kennedy

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The so-called “Camelot” era, though brief, profoundly impacted American politics, culture, and foreign policy. Kennedy's charismatic leadership and visionary speeches inspired a generation, promoting ideals of public service and civic responsibility encapsulated in his famous injunction, "Ask not what your country can do for you—ask what you can do for your country." Domestically, Kennedy advocated for civil rights, pushing for legislation that would later culminate in significant civil rights acts under his successor. Internationally, he navigated the Cold War's treacherous waters, most notably during the Cuban Missile Crisis. Kennedy's initiatives, like the Peace Corps and the space program aiming to land a man on the moon, highlighted his forward-looking approach. Despite his untimely death, Kennedy's legacy of hope and transformative leadership endures in American memory.

#3: George Washington

This American icon’s tenure set numerous precedents that fundamentally shaped the American presidency and the early government. As the nation's first president, Washington established the practice of a two-term limit, a tradition that was followed until Franklin D. Roosevelt and later codified in the 22nd Amendment. His leadership in creating the first Cabinet and the inaugural address set standards for governance. His Farewell Address further advised future generations on the importance of national unity, the dangers of partisan divisiveness, and the value of a foreign policy of neutrality. Washington's tenure was marked by his commitment to small-r republican values, the establishment of a strong federal government, and the precedence of a peaceful transition of power.

#2: Franklin D. Roosevelt

FDR was the only president elected to four terms. His time in office significantly altered American society and governance, particularly through his New Deal programs, which aimed to address the Great Depression's devastating effects. The New Deal included wide-ranging policies focused on relief for the unemployed, recovery of the economy, and reform of the financial system, including the creation of the Social Security system, establishment of the Federal Deposit Insurance Corporation, and implementation of labor protections. Roosevelt's leadership during World War II was pivotal, shifting the United States from a policy of isolationism to becoming a leader on the world stage. His fireside chats, a series of informal radio broadcasts, helped bolster American morale during these challenging times.

#1: Abraham Lincoln

Honest Abe’s leadership during the Civil War preserved the Union, abolished slavery, strengthened the federal government, and modernized the U.S. economy. Lincoln issued the Emancipation Proclamation in 1863, a decisive move that shifted the war's focus to the abolition of slavery. His dedication to the principle that "all men are created equal" led to the passage of the 13th Amendment, which made slavery unconstitutional. His assassination in April 1865 marked the first assassination of a U.S. president and left the nation without its principal leader during the critical period of Reconstruction. Lincoln's legacy as a symbol of freedom, justice, and the unyielding belief in the unity of the United States endures, making him one of the most revered figures in American history. Which other presidents do you think should be on this list, and why? Let us know in the comments.

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