What was the approximate population of the north at the time of the war?

Which statement best describes a contribution of the works of nicolas copernicus and galileo galilei?

During the cold war, the united states was involved in certain regional conflicts due to fears later called the domino theory, which stated which concept?

Which of the following quotes from the constitution describes the senate? "no person…who shall not have attained to the age of twenty five years, and been seven years a citizen of the united states, and who shall not, when elected, be an inhabitant of that state in which he shall be chosen." "the…shall chose their other officers, and also a president pro tempore, in the absence of the vice president, or when he shall exercise the office of president of the united states.""the…shall be composed of members chosen every second year by the people of the several states.""the…shall choose their speaker and other officers; and shall have the sole power of impeachment."