The United States government used propaganda as a way to make Americans support the War. The Federal government used posters, films, and propaganda to start the spirit of patriotism and increase the number of labor and military force. The Government created a special Office for that that was called Office of War Information in 1942.
The Government propaganda was successful, American citizens were very supportive of the War and even helped the government by donating metals to build more military gear.
The Supreme Court ruled that he was not a U.S. citizen of the United States and therefore could not sue for his freedom in the U.S. court system. This was a famous case that failed to provide a legal route at the time for challenging slavery in the courts.