Unit 6 By MaribelAponte Dec 1, 1793 Eli Whitney invents cotton gin Dec 1, 1794 Thomas Paine publishes The Age of Reason Dec 1, 1819 Irving publishes The Sketch Book Mar 4, 1825 House elects John Quincy Adams president May 28, 1830 Indian Removal Act Dec 1, 1860 Pony Express established.