cede

1. V-T If someone in a position of authority cedes land or power to someone else, they let them have the land or power, often as a result of military or political pressure. (迫于军事、政治压力) 割让; 让出 (领土、主权)[正式]

Only a short campaign took place in Puerto Rico, but after the war Spain ceded the island to America. 波多黎各岛仅经历了一场短暂的战斗，但大战后西班牙把该岛割让给了美国。