A subset of the Access World News collection from NewsBank, this database consists of 3,000 American newspapers. They are listed by state and are searchable individually, by state or nationally.
Atlanta Constitution (1868-1984)
Atlanta Daily World (1931-2003)
The Chicago Defender (1909-1975)
Chicago Tribune (1847-1993)
Christian Science Monitor (1908-2003)
Detroit Free Press (1831-1999)
Los Angeles Sentinel (1934-2005)
Los Angeles Times (1881-1992)
The Michigan Chronicle (1939-2010)
The Nashville Tennessean (1812-1922)
New York Amsterdam News (1922-1993)
New York Times w/ Index (1851-2013)
Pittsburgh Courier (1911-2002)
The Wall Street Journal (1889-1999)
The Washington Post (1877-2000)
Newspapers can be very useful for your research because they are so very current, with the major papers publishing every day. Also, you can find policy information specific to the fifty states.
Newspaper boxes on Washington Avenue, Minneapolis, MN, 2008.
(Attributed to Susan Lesch; Wikimedia Commons)