Nick Begich Sr. was born in 1932 in Eveleth, Minnesota (Wikipedia).
Both of his parents were of Croatian descent, with his father, John Begich (né Begić), originally from Podlapača, Udbina, Croatia, and his mother, Anna (née Martinić), also of Croatian heritage (Wikipedia, Kids.kiddle.co).
The Begich family's Croatian roots shaped their cultural background and likely influenced Nick Begich Sr.'s upbringing.
There are no indications of additional ethnic groups beyond Croatian heritage in the available sources.
1932: Nick Begich Was Born In Eveleth, Minnesota According to Wikipedia, "Begich was born and raised in Eveleth, Minnesota. His father, John Begich (né Begić), was born in Podlapača, Udbina, Croatia. Nick Sr.'s mother, Anna (née Martinić), was also of Croatian descent." [Wikipedia, 6/9/24]
Nick Begich Was Of Croatian Descent According to Kids.kiddle.co, "His father, John Begich (né Begić), was born in Podlapača, Udbina, Croatia, Nick Sr.'s mother, Anna (née Martinić), was also of Croatian descent." [Kids.kiddle.co, 10/18/24]
1932: Nick Begich Sr. Was Born In Eveleth, Minnesota To Croatian Immigrants According to Wikipedia, "Begich was born and raised in Eveleth, Minnesota. His father, John Begich (né Begić), was born in Podlapača, Udbina, Croatia... Nick Sr.'s mother, Anna (née Martinić), was also of Croatian descent." [Wikipedia, 1/19/25]