during world war II, the US government sent people of Japanese ancestors to internment camps based on

The main argument was the fear of treason or the conflict of loyalties after the attack on Pearl Harbor.

Explanation:

However, the internment was based on local demography. In the Continental US, over 110,000 Japanese Americans (first, second or third generation) out of 127,000 were incarcerated! Whereas in Hawai, Japanese Americans were a third of the population and only around 1500 were interned.

In truth, racism more than National Security seemed to have fueled the internment of Japanese Americans.