All you have to do is google the global map and fill it in.
Austria-Hungary had invaded and crossed over into, Serbia and Russia was in an alliance with Serbia, so they felt as though they had to help out. Hope this helps.
The final solution was carried out through, well, the holocaust. You have the answer, but I would say the final solution was carried out through the mass killings of approximately 6 million Jews (and other minorities) in order to reserve the so called “pure blooded Aryan race”
Old testament is associated with Judaism and the new testament is with Christianity