1. The automobile was an affordable way for Americans to travel. Many Americans had automobiles before the had a proper toilet. 2. The economic "boom" was called the Roaring Twenties. The contributing factors were automobiles, movies, etc. 3. President Coolidge believed in Federalism.
Radial tires, The first musical synthesizer, The first nonstick pan produced, Tetracycline, Fortran which was a computer language, and t<span>he modem was invented.</span>
