Located in the lower northeast section of Philadelphia, Frankford was first settled by Swedish immigrants in the mid-seventeenth century, and it rivaled Philadelphia itself in notoriety. At one time, Frankford was considered one of the most thriving manufacturing areas in the state. Built along the banks of Frankford Creek, which flows into the Delaware River, Frankford grew for centuries and witnessed many of America's historical events and people. In 1854, it became a part of the city of Philadelphia. Frankford was home to the Frankford Yellow Jackets, one of the first NFL teams in America. Now a vital connection in Philadelphia's Market-Frankford elevated system, Frankford continues to be one of the city's best-known neighborhoods.