World Development Group/U.S.A. Contractors, Inc./ U.S.A. Enterprises is headquater in California, U.S.A. We are Buyer/Sellers (Gold, Crude Oil, REBCO, BLCO, D2, Mazut M100, LPG Jet Fuel and LNG), Engineering, Energy(crude oil), Construction, and Power(solar & Generator(Ultra Silent generators & Regular Generators ranges:25 KVA to 2 Megawatt) entity. We do Currency Exchange (EURO,USD,NKD,JPY). We trade Gold (Dust,Ingot,Bullion) , Portland Cement (Sell 42.5 . 42.5R, 32.5), Copper Cathodes.