Separation from a main group to form a new group as a result of disunity is called a)prejudice b)discrimination c)segregation d)affiliation

The right answer is "segregation"

Segregation is the process of dissociation by which individuals and groups lose physical and social contact with other individuals and groups. This social or physical separation or distance derives from biological and social factors such as race, wealth, education, religion, profession, nationality, etc.

the answer would be:

b. race

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.