America says that a considerable amount of drugs like cocaine etc.are supplied to America and Latin America,People of Venezuela migrated to America.These are big concerns for America.Trump Government also claimed that Maduro is directly involved in drug trafficking. But the actual cause is Venezuela's oil.According to a survey,Venezuela has about 3000 billion barrel of oil which is largest in the world.America has captured all oil refineries.So it is cleared why America attacked Venezuela.