Luis Manuel Pérez waiting for tourists to hire him for a ride around Havana, Cuba in 2024. The Trump administration, which has tightened the U.S. chokehold on Cuba by cutting off foreign oil, is betting that this is the Cuban communist revolution’s last year. (Jorge Luis Baños/The New York Times) By FRANCES ROBLES and VJOSA ISAI By the second week of Debbie Sutherland’s vacation to Cuba last month, there were ominous signs of trouble. Gasoline was being rationed, excursions were canceled and...