When Irish came to this country they were as low (in the minds of locals) as blacks. They were the bottom rung of society. They were compared to a people that they had NO knowledge of, there werent any black people in Ireland in the 1800's. They were forced into the "ghettos" of New York and Boston mainly and lived along side blacks and other immigrants that weren't WASP.
They fought the perceptions that many held about them. Like ANY group of people, they considered the problems that faced their own people the most important. Irish were considered about problems that faced other Irish, just like blacks were concerned about blacks, Germans-Germans, and Americans-Americas ect. ect. ect. They were determined to not allow Americans to treat them like the British did. So they fought the against the term "nigger" and "mick" and "paddy" that they were called. They concerned themselves with bettering their people. And they succeeded after years of struggle. They didnt have time to fight against slavery they were fighting "No Irish Need Apply" signs that hung in every window and the horrible living conditions they were forced live in. To say that Irish are a racist people is just wrong. It is more accurate to say that they are firstly concerned about other Irish. They came from a country were they were oppressed by a foreign people and wouldn't allow it 2 happen again. Im sure they said some unflattering things about black people but not because they hated them but because they hated the prospect of continuing to be treated like black people were in this country. They had to break the connection and misrepresentation that Americans were making between them and black people, the things people thought about black people was obviously bullshit, but it would have been pointless for Irish to fight that, all they could do was fight the comparisons and the way they were being treated.
BUT anyone who knows the story of Fredrick Douglass knows that he was inspired to escape slavery by two Irish men he met while helping them (he offered to) work in i think it was Baltimore. He later went to Ireland and made a moving speech about the similarities between African-Americans and Irish people. Heres a mural of Fredrick Douglass in Ireland, and there are several around the country. He is proof that not all Irish were against black people and somehow were against abolition.
Irish are naturally opposed to oppression having been through it for hundreds of years. Thats why many support the PLO, Bosnian's and other peoples fight for freedom.
Im not defending the draft riots that took place in New York or any other negative thing that may have taken place between blacks and Irish in America, im just tryin to explain that it wasnt based on hate or racism but it was due to the 2nd class status that both groups faced in this country and how both groups fought against it.