is the city of South Bend, which has a large African-American population. These signs remained posted well into the mid 60s until the Fair Housing Act of 1968 which banned racial discrimination in the sale, rental, and financing of housing. Although the city has since become more inclusive, the African-American population still remains remarkably low at 0.6%. As of today, there has been no public acknowledgment by the city of its history of exclusion. Later History On July 6, 1915 the Liberty Bell stopped in Plymouth on its trip from Philadelphia to the Exposition at San Francisco. Much of Plymouth's history was documented in two major newspapers during the 19th century. The Marshall County Republican (also titled Plymouth Republican and Plymouth Tribune) operated from 1856 to 1922. Its main rival the Marshall County Democrat (also titled Plymouth Democrat) appeared from 1855 to 1932 (and as a weekly only edition until January 1, 1941). During the 20th century, the Plymouth Daily Pilot acquired the Republican in 1922, and the Democrat became the Plymouth Daily News in 1932. The News and Pilot merged to become the Plymouth Pilot-News in 1947. As part of Plymouth's sesquicentennial celebration in 1966, organizers created the first Marshall County Blueberry Festival, to take place over Labor Day weekend. This tradition has continued annually, and the Festival typically brings in tens of thousands of visitors over the four-day event. In July 1982, five firefighters were killed when their fire truck overturned while responding to a call. The tanker truck crashed on a curve near West School on state road 17. The East Laporte Street Footbridge, Heminger Travel Lodge, Marshall County Courthouse, Plymouth Downtown Historic District, Plymouth Northside Historic District, Plymouth Southside Historic District, and Plymouth Fire Station are listed on the National Register of Historic Places. Economy As the center of commerce for Marshall County, Plymouth provides a large percentage of jobs in the manufacturing, retail, and service sectors. Major manufacturing employers include Hoosier Racing Tire, Zentis, Oasis Lifestyle, Pregis Innovative Packaging, Pretzels Inc. and the Maax Corporation. Eight U.S. manufacturing headquarters are located in Plymouth: Oasis Lifestyle, American Containers, Inc., Arrow Services, Inc., Indiana Tool & Manufacturing, Co. Inc (ITAMCO) U.S. Granules Corp., Wiers Manufacturing, Inc. and Zentis North America, LLC. Parks and recreation Centennial Park Plymouth is home to nine parks. Centennial Park is the largest park in Plymouth. It is equipped with a swimming pool,