The Monroe Doctrine was a principle of non-interference advocated by President James Monroe during his annual speech in 1823. The message behind this doctrine was to stop the European powers from interfering in the affairs of the Western Hemisphere ( Americas).
It warned against the Europeans from interfering into the matters of the independent nations of the Western Hemisphere as U.S grew a close relationship with its continental neighbor, the Americas.
The Columbian Exchange or Grand Exchange, was the widespread, at the time, communicable diseases were a byproduct of the exchange.Slaves were a popular trade it em between Africa, Europe, and the American.
