Answer: The main difference between Census and Population is that the Census is a acquiring and recording information about the members of a given population and human population that live together in the same place
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In my own words: Population is how many people living in a certain place and census is getting information about the people in a population.
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It has the answers marked on it.
Most of immigrants came from Europe because the economic condidtions on the contitent, transition from agriculture to industry, famine, overpopulation and so on. When the US closed the west frontier, immigrants were looking for new territories and they decided to go north. Yukon gold rush in Canada, new railways all contributed to the increase of immigration to Canada and northern territories.