Final answer:
True, specialized magazines did begin to appear in the United States in the nineteenth century; National Geographic, established in 1888, is a notable example.
Step-by-step explanation:
The statement that specialized magazines began to appear in the United States in the nineteenth century is True. The latter half of the 19th century, particularly with the advent of the linotype machine and the expansion of roads and waterways, saw significant advancements in the production and distribution of printed materials, leading to a proliferation of newspapers and magazines with a variety of content. National Geographic, founded in 1888, is an example of a specialized magazine that became a staple in American educational resources and is known for its illustrated coverage of diverse subjects such as science, geography, and world cultures. Specialized magazines catered to various interests, representing multiple viewpoints from across the political and social spectrum, thereby enriching the American media landscape and promoting professional journalism.