Hello! Charchar here!
Answer:
The purpose of a map key is to tell you the meaning of the symbols on a map. The key on a map interprets each symbol so that you can read and understand the map.
Explanation:
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By giving military commanders the authority to determine when, where, and how long a person needs to be detained, President Roosevelt is assuming that <span>all the commanders will move forward fairly and with sound judgment. This is what he says:
</span><span><em>"...whenever he or any designated Commander deems such action necessary or desirable, to prescribe military areas in such places and of such extent as he or the appropriate Military Commander may determine..."</em></span>
the author's purpose and what genre it is