Hey man, America's future 
depends on space travel and here is why:
-Science and technology are the greatest engines of economic growth.
-Medical researchers used an advanced image-processing software first used by hubble telescope to assist in early detection of breast cancer.
-We are running out of energy(fossil fuel) here on earth. the moon contains Helium-3 which could be used as a cleaner, more efficient fuel for nuclear fusion.
-more efficient solar panels could be developed in space
-Technology used to monitor astronaut health in space that has been used by doctors to help treat people in remote regions across the globe.
-Microspheres developed on space shuttle have been used by industry to clean up major oil spills.
-Development of digital implantable hearing aid technology that has restored hearing to over 60,000 people.
-Development of newer and better products in zero-gravity environment
etc....
So...space exploration continues to give us innovation and discovery. The thing that makes space so special is that it is a totally different environment then we live in. by conducting experiments in this type of setting can change a lot.
Space is the final frontier after all.    
