U.S. National monuments: Presidents can create them, but only Congress can undo them April 30, 2017 historyscoper https://repubhub.icopyright.net/freePost.act?tag=3.19253%3Ficx_id%3Dhttps%3A%2F%2Ftheconversation.com%2Fnational-monuments-presidents-can-create-them-but-only-congress-can-undo-them-76774&utm_campaign=POLITICS&utm_content=53405642