4. What did events like the Walking Purchase prove about treaties between Europeans and Native Americans?

A)They were more effective than treaties in Europe.

B)They had the power to prevent or put off war.

C)They would last longer than most treaties.

D)They mostly served European Interests.

Which statement best explains why a supreme court opinion is a seminal document? an opinion can become quite lengthy, which makes it a seminal document. supreme court documents are the only seminal documents in the united states. an opinion may create major changes in the laws or policies of the united states. generally speaking, a supreme court opinion reflects the feelings of all americans.