In 1811-12, the greatest earthquakes in North American history enlarged existing bodies of water, blocked inflowing streams, and extended the boundaries of a cypress swamp to form Reelfoot Lake, a haven for fish and wildlife that attracted Davy Crockett and other hunters. Originally about 40,000 acres, siltation has shrunk the lake to about 14,000 acres. This area remained the hunting ground of the Chickasaws until 1818. When settlement began around 1820, use of the lake was held to be a common right. When an organization achieved legal control of the lake in the early 20th century, some area residents organized as "Night Riders" to resist the loss of their fishing rights. Their efforts focused public attention on Reelfoot's problems and potential, and the state acquired ownership in 1914. Conservation efforts seek to preserve the lake and protect its wildlife, which includes the American bald eagle.