Trump’s event will cost between $25 million and $45 million, depending on how much damage the tanks inflict on D.C. roads, the Army said.

President Trump presided over the largest U.S. military parade in decades along with a sparse, but subdued and celebratory crowd in Washington.

Hours before he left the White House, the day had already encapsulated the sharpness of America’s divide over immigration, free speech and Mr. Trump’s determination to reshape the government, univers...