I wish I could help:(.......
Answer:
The answer is territoriality.
Hope this helps :)
The answer would be The Berlin conference.
<em>B. Area near a sea having flat land and low relief</em>
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<em>A coastal plain is flat, low-lying land adjacent to a sea coast.</em>
amplify each other’s effect during Tide 1 and cancel each other’s effect during Tide 2