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In this Oct. 4, 2015, file photo, President Barack Obama pauses as he speaks in Emmitsburg, Md. The White House is expected to announce Monday, Oct. 5, the designation of two new marine sanctuaries in the tidal waters of Maryland and Wisconsin’s Lake Michigan, the first chosen in 15 years. (AP Photo/Carolyn Kaster, File)

Obama makes marine preserve in tidal Potomac River (access required)

VALPARAISO, Chile — President Barack Obama declared new marine sanctuaries in Lake Michigan and the tidal waters of Maryland on Monday, while Chile blocked off more than 200,000 square miles of the Pacific Ocean near the world-famous Easter Island from commercial fishing and oil and gas exploration. The announcements came as top officials, including U.S. Secretary ...