US STOCKS-Wall St gives up gains on weaker view of US economy By: Reuters: Company News July 15, 2011 at 10:53 AM EDT * BHP Billiton to acquire Petrohawk, energy shares jump Read More >> Related Stocks: Bhp Billiton Ltd ADR Bhp Billiton Plc ADR Chesapeake Energy Citigroup Clorox Co Google, Inc. Home Depot Standard & Poors 500