The assassination of Archduke Franz Ferdinand set off a chain of events among European alliances that led to war.
It was home of people of many religions (Islam, different Christian sects) and many ethnic groups (Serbs, Albanians, Croats). Some people identified as members of those groups, but slowly, sometimes a more unified "Yugoslav" identity was emerging - but not everywhere.
Buffalo soldiers were African American soldiers who mainly served on the Western frontier following the American Civil War.
The correct answer therefore must be choice A. African American U.S. cavalry units that fought against Comanche.
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