19. Jackie Robinson
Jackie Robinson, the first African American to play in Major League Baseball, not only broke the sport’s color line, but also gritted his teeth and battled death threats, racist hotel policies, and even ignorant teammates who refused to play with him. Because of his courage, he paved the way for African American athletes across all sports.
18. Abraham Lincoln
When your face is on Mt. Rushmore AND two forms of currency, you’re about as American as anyone who’s ever set foot South of the 49th parallel can be. So when he wasn’t leading the Union to victory and keeping the United States united, he emancipated the slaves and gave perhaps the most notable speech in American history, the Gettysburg Address.
17. Mark Zuckerberg
We'll just go ahead and say it: Facebook is the most relevant American contribution to the world in the past decade. If you disagree, name a greater one. Its creator managed to make billions despite dropping out of college, proving once again that you don't always need a degree to make it big in this country. In essence, he's given freedom of speech to the entire world. Some use it to make great political strides; others, to tell you they're at the gym.