Why does the United States impose comprehensive economic sanctions on Cuba?

At the beginning of the victory of the revolution, Castro led the people of the whole country to carry out land reform, and at the same time confiscated some properties of big manor owners and big bourgeoisie, including American owners, thus infringing on the interests of the United States. 1962, the United States officially announced the implementation of comprehensive economic sanctions against Cuba. Castro led all Cuban people in an indomitable struggle with the United States.