Http://m.historyextra.com/feature/complex-crimea-history-relationship-Russia-Ukraine-Crimea
Answer:
Race; ethnicity.
Explanation:
As the exercise explains, race is grounded in physical attributes which are then transformed to have social meaning (Darker or lighter skin, height, facial traits, etc.). Ethnicity, on the other hand, is a cultural-historical identification with a group, just like this explains, an identity. An ethnic group is a group of people who identify with eachother. The cause of this identity could be similar traits, geography, language, etc.
A: they have a sparse population
The war officially ended in 1783