The historical figure who famously declared, "I only regret that I have but one life to lose for my country" is Nathan Hale. Hale was a soldier during the American Revolutionary War and is best known for his role as a spy for the Continental Army. His famous words reportedly came right before his execution by the British in 1776, symbolizing his patriotism and commitment to the American cause. His sacrifice and bravery have made him an enduring symbol of American heroism, and he is often commemorated for his dedication and willingness to give his life for the freedom of his country.