Public speaking is one of the oldest arts, practiced by everyone from shamans to statesmen and other leaders throughout history. It's not surprising that some of our country's most cherished and effective leaders have also been master orators, capable of moving and inspiring their audiences with the power of words. Here are five of the most famous speeches in American history:

The Gettysburg Address
Abraham Lincoln's powerful address is perhaps the most quoted speech in American history. It highlights Lincoln's incredible eloquence, but also his profound use of brevity. In just over two minutes, he spoke of human equality at the roots of the American experience, and the Union's struggle in the Civil War as one to preserve and renew freedom.

Lou Gehrig Farewell
Incredible Yankee's first baseman Lou Gehrig had his career cut short when at 36 he was diagnosed with the disease now bearing his name. Celebrating all that he was grateful for, Gehrig used his farewell address to proclaim himself as "the luckiest man on the face of the earth."

"I Have a Dream"
Martin Luthur King Jr's words have inspired countless millions as he called for an end to racial inequality and discrimination. This charismatic message of love voiced the hopes of civil rights, and in giving it King shared his dream with a nation.

Kennedy's Inaugural Address
When John F. Kennedy took the oath of office on January 20, 1961, he was helping to inspire America into a new era. In this stirring speech, Kennedy famously implored his fellow Americans to "ask not what your country can do for you – ask what you can do for your country."

"Give Me Liberty or Give Me Death"
Before America was America, Patrick Henry spoke forcefully to the Virginia House of Burgesses. The Revolutionary War had begun, and Henry wanted to organize a militia in Virginia in an effort to join the war. His famous words still ring out as some of the most impassioned words spoken on behalf of America.