Most Irish Americans are ethnically American (or more precisely, white/European-American with partial Irish roots). They are US-born citizens, raised in American culture, speaking English as their primary language, and often with mixed ancestry (e.g., Irish + German + Italian + whatever else from intermarriage over 4–6+ generations since the big 1840s–1920s waves). Surveys show only a small fraction claim "full" Irish ancestry (around 3–11 million depending on the year/source), and even fewer are recent emigrants or hold strong ongoing Irish identity beyond symbolic stuff like St. Patrick's Day.

Yes, Indian Americans are ethnically Indian in the sense of having Indian ancestry or ethnic origins from India—they self-identify as such on censuses, and official sources (like the U.S. Census Bureau and Pew Research) classify them as people of Indian descent, often under "Asian Indian" ethnicity within the broader Asian American category.

(http://www.autoadmit.com/thread.php?thread_id=5845534&forum_id=2)#49742922)