One defining characteristic of the Era of Good Feelings was the industry. People began to work in factories as well as produce steamboats, engines, etc.
Pride, power, military, and the assassination of this person I can't remember
(Not related just helpful. can't not is a double negative. "I can't not leave'' means I can leave)
The biggest reason is probably we can even travel to Mars. Mars is only one planet away from us. the distance is to far for fuel and time. we would need to go much faster and a lot less fuel just to get to Mars.
