Answer:
An opinion may create major changes in the laws or policies of the United States
Step-by-step explanation:
A seminal document is a document or a speech holding highly influential ideas that serve as a basis to develop or research those ideas further. A Supreme Court opinion is a seminal document because it has the power to influence further decisions, and create major changes in the laws or policies of a country, like the United States. The amendments of the US Constitution are great examples of the influence of Supreme Court opinions as seminal documents.