Answer:
The article first begins by explaining how and why the Irish-Americans were initially viewed by some Americans as being unfit to be called Americans because the Irish as Catholics, followed the Pope who was not American.
It then continues on to show how the Irish were given an opportunity to change this perception that some Americans had during the War between the States otherwise known as the American Civil War where they could show that they were loyal to the United States and therefore as American as the rest.
The American Civil War while deadly, gave the Irish a change to shine because they joined the war effort in their tens of thousands in both the Union and the Confederacy with the Union getting most of them. This forced Americans to see that the Irish-Americans were Americans and afterwards the process of assimilation began.