MIAMI — Sunbathers on a popular Florida Keys beach watched Monday morning as a wooden boat coasted to the sand and about 20 Cuban migrants jumped into the shallow water — running to what they hope is a new life in the United States. Their arrival on Sombrero Beach, in the Middle Keys city of Marathon, capped a three-day period that saw close to 90 people from Cuba make landfall throughout the Florida Keys in several separate migrant events, according to Border Patrol officials. Monday’s landing was captured on cellphone video by Marathon resident Yandy Carrillo, who posted the footage to his F...