Amelia Earhart was 39 when she disappeared.
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This historian would be using the skill of "comparative analysis," since he or she is comparing a wide variety of sources to draw a conclusion between them as a group.
Answer:
Which conditions in northern Europe encourage emigration between 1845 and 1860?
Famine and warfare
The correct answer is letter A.
Explanation: In the nineteenth and in the twentieth century most of people classified as middles class were living in tenement houses with bad conditions, but it was where they could live.