Why do Americans always make fun of the Irish?

The first generation of American immigrants mainly came from Italy and Ireland. The main reason why Irish immigrated to the United States was that there was a serious famine in Ireland at that time. Their main food, potatoes, was in serious shortage, and many people starved to death. So they left Ireland and came to America. Irish and Italians mainly live in the eastern United States, new york, Boston and Philadelphia. The Celtic pair in NBA is made up of Irish descendants. At that time, Americans liked to joke about Ireland because of historical immigrants and conservative accents. Now, it may be left over from history.