C) Segregation was necessary to preserve public peace.
Explanation:
Plessy v. Ferguson, 163 U.S. 537, was a landmark judgment of the U.S. Supreme Court announced in 1896. It confirmed the constitutionality of national discrimination laws for public facilities as long as the segregated facilities were equal in worth a concept that came to be recognized as separate but equal. The Court governed on the idea of separate but equal and set back civil rights in the United States for decades to come.
When countries make treaties and agreements with each other, it promotes trade among themselves. This can include trying to do certain things to help the environment, or agreeing to help each other in times of war.
I think it really depends on what you believe in. However, if you're talking about a classification of a bi-racial child, then the child is most likely as to what ethnic the father is.