What would be a result of the Hapsburg's reign over so many ethnic groups who often resented their control?

turmoil and revolts

Explanation:

Austria struggled with protests and revolts but they usually were able to put them down because they were based on one group and couldn't grow.

in 1918-21 Austria Hungary exploded into ethnic chaos and warfare as the many groups struggled against eachother

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

the answer here would be