The obvious case is the consequence of climate change, where my emissions of greenhouse gases affects your sea level and climate (and vice-versa). aerial or marine pollution and overfishing in the oceans are others.
In a more restricted sense, one nation may hold all or most of a resource needed by all. Many nations are unable to feed themselves, at least to present standards, and therefore need to trade with others.
Answer:
Migration from rural areas to big cities and suburbs
Explanation:
This is because of new road systems, and the movement of more and more people from rural areas to suburbs and cities, urbanization took a big foothold in society.
they were instructed to trow it in pearl harbor i belive.
