Answer:
Many were Irish immigrants who had come to the United States to escape economic hardship, but found themselves fighting in the Mexican-American War against their adopted country. The American Protestant majority resented the Irish for being of lower socioeconomic status, and also for being Catholic. So they revolted
B. Allied forces began to take the offensive for the first time in the Pacific.
The offensive on Guadalcanal gave the Allies an important foothold with a very strategic airfield from which to launch missions from in the Pacific.