Series 2 offers more than 290 significant 18th- and 19th-century newspapers from every region of the United States. Series 2 focuses on the period between 1820 and 1860, when the number of American newspapers rose dramatically. In the first half of the 19th century, the number of American newspapers increased from less than 200 to more than 3,000. During this time period, westward expansion and the penny press helped create thousands of local newspapers, and daily editions replaced many weeklies. In addition, the format of newspapers was transformed by an increasing emphasis on society, industry, scientific advances, investigative journalism and stories of human interest.