Final answer:
Fidel Castro seized all American property in Cuba when he overthrew President Batista and nationalized various industries, contributing to souring relations between the U.S. and Cuba.
Step-by-step explanation:
When Fidel Castro overthrew President Batista, he initiated a series of actions to transform Cuba according to his socialist and nationalistic goals. One significant action was seizing all American property in Cuba. The new government led by Castro nationalized foreign landholdings, sugar plantations, utilities, port facilities, and other industries, which essentially ended foreign ownership in Cuba. This directly impacted U.S. interests, leading to heightened tensions between the United States and Cuba, ultimately resulting in the U.S. establishing a trade embargo.