Crude birth and death rate

Today in class we talked about mainly crude birth and death rate. He explained how even though America has 30 times as more people as Canada, technically Canada has a better Net Migration Rate. Also, Net migration rate is produced by subtracting death from birth rate = Birth - Death. The only reason why America is increasing in decreasing in crude death rate, is because of immigration. But, the only way geographers can measure these numbers, is by tracking them in the 1,000's. Since there are 30x more people in the United States than Canada, doing it by the millions would be crazy, so it kind of keeps things a little more simple.

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