Day and night occurs because the Earth revolves around the Sun, and when the Earth revolves, different parts of the Earth get sunlight at different times. When it is night in one place, it is daylight in the other. This is because we only have one Sun and wherever the Sun is, that is where it will be bright.
The borders.
It was based and developed on the idea that the cotton producing and other "Goods States" had more value with slaves. Abolishing slavery would in turn take its toll on the states.
"Surrogate wars" also known as "proxy wars" are wars fought in a third country. The US and the Soviet Union were fighting each other in, for example, Afghanistan and Vietnam.
They preferred proxy wars, because they came without civilian victims of own population and without a distraction of the infrastructure of their own countries. In short, the two powers could compete militarily with each other without suffering the worst effects of the wars - this situation allowed them to try to defeat the other one without much risk to their own population.
Answer:
it was based on a power struggle
