Eastern European countries were most susceptible as many Slavic countries already existed in that area. Furthermore, when Germany was cut in half, so was Europe, Germany backwards. Many of the Countries in the Eastern Europe were also just under the control of the Nazi's, hence it was a place of freedom for those countries.
It's possible but extremely unlikely to Revive an extinct animal but It is possible to create an organism similar to whatever extinct animal that is in question using its dna or the dna of its relatives. If scientists did revive extinct populations it could have an extremely detrimental effect on humans and our environment.
