b e n i c e a n d g o o d w i l l c o m e b a c k t o y o u b e c a u s e k a r m a i s a b i t c *
Nationality would be the country a person was born in. Ethnicity would be their ethnic or racial background.
Example:
A person could be born in Canada and be Canadian but their ethnicity could be something like Chinese or African.