 However, between 1824 and 1829, with financial support from the states of Maryland, Delaware and Pennsylvania, over 2600 workers built the 14 miles long Chesapeake and Delaware Canal, which became for a while the busiest canal in the new nation.The U.S. Army Corps of Engineers still operates it today, and Chesapeake City, Maryland, which had been Bohemia Manor until 1839, has a museum explaining the canal's importance.Railroads and bridges also proved economically important to Cecil County and surrounding region.