An extreme decline in the native population, the rapid growth of a non-native crop, and a massive introduction of slaves were all effects of the columbian exchange on which of these areas?

The area is Caribbean Islands
The Caribbean island refers to the large archipelago located in the Caribbean sea. It was one of the areas that the Spanish established their first oversea colony. However the native Indians who were to provide labor sharply declined in population as a result of diseases. It resulted to the shipping of slaves from Africa, and introduction of new crops. 

The Roman general Odoacer overthrew the last Roman emperor Romulus Augustulus.

Explanation:

The very act of the fall of the Western Roman Empire is a classic act of military coup. The young emperor Romulus Augustulus did not have the capacity to oppose the Roman general. After the fall of the empire, Odoacer did not want to execute the Roman emperor, which is enough to say that he did not pose any threat. The fall of the Roman Empire is the product of decades of weakening of the empire's institutions. With the fall of the Western Roman Empire, Rome was not destroyed since its eastern half, also known as Byzantium, continued to exist for about 1,000 years.