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.
I believe the question is A.Their loyalty to the United States, EXPLANATION- I believe it's A because this question seems like it was during the early 1900s Maybe in WW1 or 2.