The relocation of Japanese Americans from the

West Coast during World War II occurred because

(1) most of them were not citizens of the United

States

(2) they refused to serve in the United States

military

(3) they were needed to work at inland defense

industries

(4) military authorities considered them a threat

to national security

Verified Answer :

The correct answer is:
(4) military authorities considered them a threat to national security.

Many of them (around 60 percent) were born in the US and no longer had any contact to Japan, and some didn't even speak Japanese, yet they were considered a threat (unjustly).