The original legal reason that they wanted to prevent the people of the U.S territories from full citizenship was because they believed that they were not able to understand Anglo-Saxon principles.
I think the mixed-market system describe american economic system the most.
the mixed market have both the free-market and socialist market characteristic
It's true that in early U.S history, the american economic system is closer to the free-market,
But as the united states developed, it's improtant for our government to be involved in some part of economic affairs in order to obtain some social aims
B. 1 millivolt is equal to .001 volt