adcelannotate = {"mobilepaywallcategory" : "MOBILE_PREM-BUSINESS","nativepaywallcategory" : "NATIVE_PREM-BUSINESS"};BENTONVILLE, Ark. — The group cheer at Wal-Mart's third annual U.S. manufacturing summit — convened to find more American-made products — was greeted with a voice from another era. "Almost anything can be made by Americans, in this country, and be done efficiently," founder Sam Walton said in a grainy black-and-white video clip from the 1980s, explaining Wal-Mart's mission to buy more products at home.