Also known as Marine salvage, Wrecking has lost its ground as economically it is no longer viable option, for it needs substantial investment to go under the water to wreck a wrecked ship, and does not guarantee any major return. Although obscure, it was practiced in some parts of the coastal region, again as an unregulated act of forced possession. Wrecking has been a predominant activity during the 16th, 17th and the 18th century in the different part of the America. However, the civil war drastically cut down the volume of shipping in the Bahamas and the Florida Keys, and as a result, wrecking delined sharply. It was further affected by the construction of lighthouses to reduce the number of wrecks. By the end of the 19th century, wrecks were infrequent and almost diappeared after the court closed the book of wrecking licenses in 1921.