The colony being described is Georgia. It was founded in 1732 and it served as a military protective zone between the English colonies and the Spanish settlement in Florida.
It is D. The colonists of Roanoke simply disappeared without a trace. The monarchy of England did not give them an order to abandon the settlement; they simply abandoned it for no known reasons.
The answer is going to be D) returned to his home in Virginia. There, he guided the country after the Revolutionary War as the first President of the United States. He later resigned his post after eight years, and Thomas Jefferson took the mantle as the second President, narrowly defeating the young Aaron Burr for the position. Washington continued to live in Virginia even after he was President.
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The primary positive effect of the Columbian exchange was the introduction of New World crops, such as potatoes and corn, to the Old World. The most significant negative effects were the transmission of African populations into slavery and the exchange of diseases between the Old and New World.
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