Miles from the rather somber Manhattan courtroom where he has spent much of the past five weeks as a criminal defendant, former President Donald J. Trump on Thursday stood at a park in the Bronx, surveyed the crowd and acknowledged he had been concerned over how he might be greeted at his first rally in New York State in eight years, and his first ever in the borough. In front of him was a more diverse crowd than is typical of his rallies, with many Black and Hispanic voters sporting bright...