The short answer is: "to a great extent". The entire plan of the Federalists was to create a strong central government instead of having many autonomous states. Of course this occasionally went against national unity in the sense that some people were opposed to this plan, but in general they favored unity.
Answer:
Since businesses are allowed to pursue profit however they like, goods and services that don't give profit will not be produced. This can limit the amount of goods and services citizens have as a result of free market.
I think it was the Portuguese who first took it over.
It would be "b. regulating interstate and foreign trade," that is technically a non-legislative power of Congress, since this has to do with the commerce clause of the Constitution.
