During the second half of the nineteenth century, an inexpensive paperback publication increased in popularity and appealed to a broad audience, including working-class people. What was this format called in the United States?

This is the tabloid.  

Explanation:

Tabloids are a product of the 19th century mass communication. They have a small format, they´re easy to read and run sensationalist stories about crimes, blood incidents, sex and gossip about the famous and rich, and a series of uncommon events. The design is condensed and usually runs much photographic material.

the united states didn't wanted to get involve with other countries probelms

explanation:

hitler's  "rise" can be considered to have ended in march 1933, after the reichstag adopted the enabling act of 1933 in that month. president paul von hindenburg had already appointedhitler  as chancellor on 30 january 1933 after a series of parliamentary elections and associated backroom intrigues.