Answer: Marriages between Germans and Jews were prohibited.
Cooperation
A bit more info: Cold War tensions between the U.S. and the Soviet Union from 1967 to 1979. The era was a time of increased trade and cooperation with the Soviet Union and the signing of the Strategic Arms Limitation Talks (SALT) treaties
Answer: Social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live.
(looked some information on this topic up to help you a bit better)
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The difficulties they struggled with was the Bubonic plague also known as the Black Death caused by bacterium yersinia pestis and civil war.
