He has a dream — of leading a New York City that is home to far fewer Midwesterners. Brooklyn Borough President Eric Adams — the leading fundraiser in the 2021 mayoral race — used Monday’s Martin Luther King Jr. national holiday to deliver an inflammatory broadside against newcomers from the nation’s heartland. “Go back to Iowa, you go back to Ohio,” he said during a speech in Harlem. “New York City belongs to the people that was here and made New York City what it is.” Speaking at the National Action Network’s “King Day Celebration,” hosted by founder the Rev....