A great example of this are Japanese Americans. After Pearl Harbor, many Americans has irrational fears that Japanese Americans were spies and saboteurs. With these fears and racism, the Us government ordered over 100,000 of these citizens from the West Coast to internment camps. This was done with the previous mentioned factors, plus the fear of an imminent Japanese invasion of the West Coast.
Basically it was the colonies (America) V. Great Britain again. Causes of the war included that the British tried to restrict American trade, and America's desire to expand.
