In his first year as U.S. president, Donald Trump represented a clear break in style and substance from his predecessor, Barack Obama – and from many of the chief executives who came before them. The businessman-turned-politician upended Washington with unrestrained rhetoric and an “America First” agenda that included renegotiating international trade pacts, withdrawing from a worldwide climate change agreement and curtailing immigration into the United States. At home and abroad, the public reacted strongly to the White House’s new occupant and his policies. Confidence in the U.S. president plummeted in many countries, particularly in Western Europe, while opinions of America itself also declined sharply. In the U.S., already-wide partisan gaps on fundamental political values grew even wider. A fraught relationship between Trump and the press drew frequent attention, with large majorities seeing it as unhealthy and an impediment to Americans’ ability to access important political news...