The U.S. Treasury Department on Tuesday authorized American banks to broadly conduct indirect transactions with their Cuban counterparts as part of an effort to stimulate bilateral trade between the nations. Beginning Wednesday, American financial institutions can process "u-turn" transactions originating or ending in Cuba, and accept travelers' checks and U.S. currency "presented indirectly" by Cuban banks through newly authorized, U.S. dollar-denominated correspondent accounts in other countries, according to regulatory revisions published by the department's Office of Foreign Assets Control, or OFAC. The amendments to the Cuban Assets Control Regulations, a near-comprehensive trade embargo that has been in place since 1962,...