They were fought in combat; on land, sea, and air.
Russo-Japanese War happened in 1905.
Second Sino-Japanese War happened on 1937-07-07.
First Sino-Japanese War happened on 1894-08-01.
Manchuria
America held the Japanese in camp during WW2
An allied power during that war.
The Japanese-Americans were compelled to enter into internment camps .
The Japenese were on the Japanese side in WW2
Most Japanese were interned for the duration of the war.
Japanese-Americans have always been a valuable part of any American war effort. During World War 1, they served as part of the All Japanese Company D unit, First Hawaiian Regiment of Infantry. Japanese Americans were a large portion of Hawaii's population during the time, and stepped forward to enlist willingly. They hoped their enlistment would lead to them gaining American citizenship. Sadly, this did not happen.
Not during the 20th century.
No