Which topic is open used as a theme for studying history since world war one

What would happen if people from different races were seperated today

Which of these describes a social effect of the civil war? a) fields were left unplanted because the slaves had been freed and much of the male population was unavailable to plant or harvest crops. b) over 600,000 men died, mostly because of the lack of food, clean water, and hygienic medical practices. c) after the emancipation proclamation was issued, african americans were allowed to join the union army. d) lincoln’s assassination after the surrender caused a disruption in the rebuilding of the nation.

Whenever there is a vacancy in the office of the vice president, the president shall nominate a vice president who shall take office upon confirmation by a majority vote of both houses of congress