The most likely purpose is <span>to ensure that Ozamoto understands that he cannot return to his home in the exclusion zone
An area usually will be included as exclusion zone if it's contain something that would be really dangerous if spread to other area.
Examples of an exclusion zone is the area around Chernobyl after their nuclear plantation blew up.
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In the election of 1800, President John Adams ran against Vice President Thomas Jefferson.
Adams was a Federalist who believed in a strong Federal government with a central bank while Jefferson was a Democratic Republican who was wary of a strong central government.