Are you reffering to Irish Slaves? Thats not fair a comparison, because there was nothing beneath a black slave during those times. Chinese have also dealt with some pretty brutal treatment in America, for example the Chinese Exclusion Act. But weren't blacks excluded in this country also? (Jim Crow Law) plus they were slaves for hundreds of years.......
It's impossible to compare other groups mistreatment in America to one another, because they are all different, and they all have had different affects on each group. Just because we all went through some sort of cruelty by the hands of devlish whites it doesn't mean that we all suffered an equaly amount of cruelty. If we all suffered an equal amount of cruelty this would be a different story. What your doing is comparing a guy that got a paper cut to a guy that got stabbed, they both were injured however each injury they suffered was different.