Last December, Trump issued two orders that removed more than a million acres of federal land from Bears Ears National Monument and more than 800,000 acres from the Grand Staircase-Escalante National Monument, both in southern Utah. The immediate effect was to open much of the declassified land to mining for coal and uranium and drilling for oil and gas. This was also a dramatic assertion of presidential power, marking the first time national monuments have been shrunk in more than half a century. With suits underway before a federal judge in Washington, D.C., it will be the first time the president’s power to shrink or eliminate monuments has been tested in court. But it is also a first look at how Trumpian nationalism could shape the American landscape.