The main way in which the nature of European exploration changed by the seventeenth century was that by this time, the major European powers such as Spain and Portugal had claimed large amounts of territory in the New World, and already exporting large amounts of natural resources back to their homeland.
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Communism was first developed by Karl Marx and Friedrich Engels in the mid-19th century.
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The Louisiana Purchase is imperative to the United States since it helped us grow over the mainland. We purchased this enormous land parcel for $15 million and multiplied the size of the US. We got the opportunity to investigate new land and work towards accomplishing Manifest Destiny, the possibility that the US ought to grow over the mainland.
Crops, Farmers, Livestock or are you talking about modern day?