Final answer:
The Irish were stereotyped as an underclass, dirty, lacking ambition, and suitable only for menial jobs. They faced discrimination and oppression, both in Ireland and in the United States. Political cartoons from that time period often portrayed the Irish in a negative light, reinforcing these stereotypes.
Step-by-step explanation:
The stereotypes of the Irish in the 19th century portrayed them as an underclass, dirty, lacking ambition, and suitable for only menial jobs. They were often discriminated against and faced oppression, both in Ireland and in the United States. Political cartoons from that time period often depicted the Irish in a negative light, reinforcing these stereotypes.