In the opening chapter of this new term, President Trump has moved with almost messianic fervor to transform America from top to bottom and exact retribution against enemies at the same time. Peter Baker, the chief White House correspondent of The New York Times, surveys Mr. Trump’s first 100 days.

Having escaped prison and death, President Trump has returned to power seeking vindication and vengeance — and done more in his first 100 days to change the trajectory of the country than any president since Franklin D. Roosevelt.