Final answer:
The claim that law is primarily about rules that constrain commerce is false, as law includes various branches, with commercial law being just one of them. The Constitution through the Necessary and Proper Clause has typically been used to expand the power of the national government, and the Interstate Commerce Clause has granted Congress the power to regulate interstate commerce.
Step-by-step explanation:
The statement that law is primarily about rules that constrain commerce is false. Law encompasses a vast array of subjects that include, but are not limited to, commerce. Commercial law is just one branch that deals with the rights, relations, and conduct of persons and businesses engaged in commerce, merchandising, trade, and sales.
The Constitution and its interpretation play a pivotal role in shaping the extent of federal powers. The Necessary and Proper Clause, contrary to the exercise question, has historically been used to expand the power of the national government, rather than limit it. The Interstate Commerce Clause gives Congress the authority to regulate commerce between states, which has been interpreted by the courts both narrowly and broadly at different times in history, influencing how commerce and related activities are regulated.
The Commerce Clause has given Congress broad power to regulate many aspects of our economy which cross state lines, but these powers are not unlimited. Recent Supreme Court rulings have shown a trend towards limiting congressional power under the commerce clause to ensure states' rights are not unduly infringed upon.