Why were people evacuated during World War 2?
Do you mean in Europe? In England, for instance, children were initially evacuated from the cities, which they knew would be targets of the Luftwaffe bombs, to the country. However, many, if not most, of the children came home again, families finding it too traumatic to be separated during this time. There were ships of children who were evacuated from England to Canada and the US, though (at least one was torpedoed on its journey). There were evacuees from other countries, mainly children, who were sent to the US or Canada. However, immigration was severly restricted during this time by a largely anti-semitic Congress, which reflected, unfortunately, the views of many US citizens of the period. (The most famous example was the St. Louis, a ship filled with Jewish refugees that was denied entry to the US and sent back across the Atlantic; most of the passengers ended up in the camps.)