Answer: People have the right to change or destroy their government when it does not uphold their end of the social contract.
This is according to the Declaration of Independence, which states:
That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, --That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government
Japan has some natural barriers against invasions. Firstly, it is an island, rendering a land invasion impossible and making retreat harder. Due to geographic conditions, Japan's lands have strategic points of advantage for Japanese soldiers. The country is mountainous and full of hills, mostly product of volcanic eruptions, presenting difficulty for invasions, especially once locals now how the best routes and positions. Due to these conditions, Japan has some regions more viable for invasion, leading the country to gather their best defenses at these spots.
Augustus was the first emperor of Rome I believe.
Improper nutrition,unsanitary,living conditions,and excessive labor made them more susceptible to diseases than their owners;the death rates among the slaves were significantly higher due to diseases.
