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Muhammad's popularity was seen as threatening by the people in power in Mecca, and Muhammad took his followers on a journey from Mecca to Medina in 622. This journey is called the Hijrah (migration) and the event was seen as so important for Islam that 622 is the year in which the Islamic calendar begins.
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German Americans were also detained. But only in certain places, in the US.
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I'm not sure eexactly wat you are looking for here but in the 1800 many cities were being made up of immigrants, fleeing to America for a better life. They changed the demographic of these Northern Cities, and played a great part in making America what it is today.
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Answer:
World War I changed the way wars were fought because of the widely known trench warfare. Because troops inside the trenches were much more protected than troops outside, it led to much more prolonged battles.
He is the seventh president of the USA.
