What was the purpose of the Sherman Antitrust Act?
to restore an element of mercantilism to the American economy
to prevent the rise of "innocent monopolies"
to prevent unfair cooperation among companies
to regulate the railroads

To prevent unfair cooperation among companies.

It outlawed trusts and regulated competition between companies and enterprises.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.