Why were Armenians suddenly under attack

The fighting appears to be driven by an attempt by Azerbaijani forces to recapture swathes of territories occupied by Armenian forces in the Karabakh war after the Soviet Union collapsed. Hundreds of thousands of ethnic Azeris were displaced from these areas in 1992-4. Pogroms, massacres and wars solidified oppositional ethnic identities between the two groups, and have contributed to the development of national consciousnesses among both Armenians and Azeris. An estimated 350,000 Armenians left between 1988 and 1990 as a direct result of the violence directed towards them.

Explanation:

b) the confederacy had to pay all union war expenses.