Answer:
A. B. D.
Explanation:
The major reasons why the U.S was involved was because german unrestricted submarine warfare destroyed allied ships carrying american passengers.
An internally displaced person (IDP) is someone who is forced to leave their home but who remains within their country's borders. They are often referred to as refugees, although they do not fall within the legal definitions of a refugee.
The earliest civilizations developed in the river valleys of: "A. the Nile River" and "D. the Tigris <span>and Euphrates Rivers" since these areas were the most fertile--meaning that crops were able to grow far more easily. </span>
