Here is your answer :)
The Catholic Church was the only thing that unified the region. The Roman Empire divided Europe into many different cultures, but the Catholic Church helped unite them all under one religion. Europe had always been Christian, but the Roman Empire forced new beliefs on the people.
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Germany lost the war because it was overwhelmed by surmounting enemy forces; it was out of soldiers and ideas, and was losing ground every day by October 1918.
Each persons group of people can contribute, then that means that they can be blamed for each cause one brings into a country.