D. The promise of cheap land was enticing to most people who made the move.
The goal of the North Atlantic Treaty Organization (NATO) was to stop the treat of communism to countries that have a capitalist/democratic society. This organization, created by the US, ensured that during the era of the Cold War that the Soviet Union would not trade to invade any of the countries involved. This organization was dedicated to sending troops and support to any nation that joined NATO if there was a threat or attack from the Soviet Union.
The Warsaw Pact was almost the opposite, as this organization created by the Soviet Union was an alliance of satellite states. These satellite states had a communist system and were essentially controlled by the Soviet Union.
The First Percent of Arrowheads Found in Southern Oklahoma.
~Was The Ancestors of Choctaw People.
~So the Arrowheads was the Indigenous Tribe.
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Economic opportunity divides urban and rural dwellers. Traditionally and historically, there are greater economic opportunities in urban areas. In urban areas, more people are concentrated in a smaller space, resulting in a need for a greater number of shops where these people can buy the goods they require. There is also a greater need for adequate transport systems. Wide enough roads need to be built to accommodate a greater number of cars and busses. This creates jobs for people as the roads need to be built and maintained.