To combine Titian's color with Michelangelo's drawing.
Well, the moment the US intervened with the affairs of the World was the moment that the US could not go back to an isolationist policy. The US simply cannot afford to stop playing a role in world affairs, due to the fact that the US is a capitalist society and that the US has a lot of exports/imports. Unless the US can reach a level of capacity where it is self sufficient, which is currently impossible to do, the US must participate in the affairs of the World in order to survive.
Answer:
A metropolis is one city with a population of half a million or more residents that sits at the core of an “agglomeration” of smaller urban entities that merge into a continuous built up area. A mega city is a very large city, typically one with a population of over ten million people. Some differences can be a mega city holds more people than a metropolis, and is a very large city, not just made up of different small urban areas. Some similarities is they're both meant for large groups of people.
