Keeping Communism from spreading beyond the countries already under it's influence
The people in Africa, sub-Saharan Africa more specifically, did not had their own written languages throughout their history. This meant that they were not able to preserve their cultural heritage in a written way, and that of course can be a problem on the long term. In order to preserve their culture, the African people used the oral way of keeping the traditions alive, mostly by telling stories to the younger ones, thus it was continuing from one generation to other. Also, the music and the dances where crucial for the preservation of their culture, by being able to see and hear the sounds and dances of their ancestors, they were able to easily accept and be interested in their culture, thus learn it, and continue to keep it alive.
The harsh terms of the Treaty of Versailles put Germany in a situation that allowed the rise of Hitler and the Nazis, leading to World War II.
The Treaty of Versailles, which came out of the Paris Peace Conference in 1919, was very punitive towards Germany. Germany was forced to admit responsibility for causing the Great War (World War I). We now call that "the war guilt" clause of the treaty. Germany also was forced to pay large reparation payments to the Allies (who opposed Germany in the war). Germany also had to give up large portions of its territory and lost colonial territories. And the German military had major restrictions imposed on it -- it had to be a volunteer military only, of no more than 100,000 men, and they could not have an air force.
The German economy and national pride were deeply wounded by the terms imposed by the Treaty of Versailles. Coupled with that, the Great Depression (which had worldwide impact) made the economic situation even worse. The bad situation in Germany made it possible for a radical leader like Hitler, making all sorts of bold promises, to win over enough people to rise to power. Hitler promised a return to national greatness and fiercely rebuilt Germany as a military machine. The rise of Hitler and the Nazis brought about World War II in Europe.
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