I believe your answer to this is the Nubian civilization.
From the Native Americans point of view, the conflict was usually caused due to "invasion" of the European settlers.
This is because the European settlers usually moved onto the Native American land without payment or permission.
It is good to know that many of the European settlers were only seeking religious freedom, that's why they were also known as "<span>pilgrims"</span>
Life in West Germany was a lot better than the life in East Germany.
One of the major differences was the freedom: of opinion, speech and press. Eastern Germans were spied on by the state (especially by the Stasi police) and one never knew whom one could trust; often family members were recruited to spy on their relatives, and houses were bugged. Also the punishment for any sign of favoring the west over east was severe, and there were cases of forced labour and even torture.
Additionally, Western Germany was richer and had access to many goods that the East didn't, most specifically western goods.
Also, the East Germans didn't really emigrate; they weren't allowed to. They had to escape and the pushiment for being caught escaping was also high (from loss of work opportunities forever to imprisonment)
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I believe that the answer is b, because he is a German engineer and the process was named the Siemens-martin process
