Escarpment is the boundary line between the great plains and west Texas.
Answer:Smallpox and vaccination are intimately connected. Edward Jenner developed the first vaccine to prevent smallpox infections, and this success led to the global eradication of smallpox and the development of many more life-saving vaccines.
Explanation:
If there isn't a fourth choice then i believe the correct answer would be "b" a governor cause a president has authority over everything and a mayor is mostly pinned to a town or city.
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Imperialism can be in the form of a colony where a foreign country is in control of a protectorate with the local government controlled by a foreign country.