Answer: True. As a group, Irish immigrants were one of the biggest supporters of the temperance movement in the United States. The temperance movement was a social and political campaign in the late 19th and early 20th centuries aimed at promoting moderation or abstinence from alcoholic beverages. Many Irish immigrants supported the movement because they believed that alcoholism contributed to social problems such as poverty, crime, and family breakdown. Additionally, the temperance movement was seen as a way to combat negative stereotypes about Irish immigrants being heavy drinkers.