What was a direct result of landlords not maintaining their tenements during the early 1900s? People were able to live there only for a certain amount of time. People got injured in unsafe living spaces. Rooms were overcrowded despite government regulations. The elevators were frequently out of order.

d. migration

cultural/diplomatic relations. most medieval japanese   culture has chinese origins. writing, architecture etc.

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."