7TH GRADE Which of these powers belongs exclusively to states?
A)the formation of roads and bridges
B)the operation of a postal service
C)the creation and collection of taxes
D)the regulation of intrastate commerce

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.