What innovation led to mass production of newspapers and pamphlets in the 1820s and 1830s?

The correct answer is the printing press. Created by Johannes Gutenberg in the early 1400s, the printing press went through several modifications before its ability to mass produce newspapers and pamphlets in the 1800s. The printing press is what allowed for the publication of the famous works, "Common Sense" by Thomas Payne and "Poor Richard's Almanac" by Ben Franklin.