The suddenness of the closing of Cuba's ports caught many unaware. Oliver Pollack, America's commercial agent to Cuba discovered that his merchandise had been confiscated by the Spanish when two of his ships from New Orleans arrived at Havana, and he was accused of smuggling.
If the capricious and moribund colonial rule of the island by Spain was the only thing getting in the way, an independent Cuba seemed to be the only answer. Unfortunately for the Yankee traders, their pleas to the new government of the United States to support revolution in Cuba fell on deaf ears. Presidents Washington and Adams surveyed the prospect of revolution in the Caribbean, and recoiled in horror when they considered that it would be fought primarily by slaves. There certainly weren't sufficient numbers of creoles – Spaniards born on the islands – to overcome the peninsulares – Spaniards born on the peninsula of Spain and loyal to its crown – and the might of the Spanish army.
Such a revolution was fought in Haiti with slaves overthrowing the government of their French masters. The American presidents feared the social, economic, and political implications of the American slave South. Thus, they believed it in the best interests of the United States to discourage any other independence movement in Cuba.