Americans did not think that Japanese Americans would fight alongside them and end up fighting with the Japanese and not against them. They had Japanese and American heritage and did not know which side they would stay true to. The internment camps provided a place which the Japanese were placed to avoid any signs of disloyalty which could be displayed to which the Americans could not risk.
The right answer for the question that is being asked and shown above is that: "TRUE." Clark was not able to maintain his hold on the fort in Vincennes, and it was retaken by Colonel Hamilton and his troops.