The battle of the coral sea introduced a new kind of warfare in which
1. troops were transported to island by plane
2. battles took place in plain view of each other
3. airplanes were used to attack opposing ships
4. ships were used to attack opposing airplanes

The Battle of the Coral Sea introduced a new kind of warfare in which airplanes were used to attack opposing ships. Option 3 in correct.

The Battle of the Coral Sea was a new kind of naval warfare, due to the fact that it was the first conflict in which aircraft carriers engaged each other, and the ships from both sides did not sight or fire at each other. This was a battle fought in World War II in the Pacific Theater, between the Japanese army and American and Australian forces. 

answer; i believe the two groups were irish immigrants and chinese immigrants;