The Moon and the Sun gravitational forces affect our tides.
This is not merely a hypothetical but a reality.
Take Rwanda.
Rwanda was drawn without an understanding of the ethnic make up.
And, in effect, a minority population was given control over a majority population.
This is problematic as it creates tensions that should not exist.
An answer could be, he used the spoil system to reward people who voted for him and people who helped fund his campaign with political office.
The principle of checks and balances refers to the system, in the American federal system, wherein each branch of government has responsibilities and obligations as it relates to the other branches of government.
The President, for one, is able to veto legislation from the Legislative Branch but a balance on that check is that the Legislative branch may override the Executive branch's veto.
It showed everyone inventions were imporant, it also made work so much easier instead of having to carry things, you could just use the pulley which was less strain on the human body and less chance someone could get hurt.