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Population Spikes

In order for a country to get bigger, it needs to have a steadily growing population. For example, Japan has an aging population and little immigration which has led to a decline in population size. This map shows where all of the spikes or population growth are happening in the United States.

AJgloe/Reddit

A lot of these spikes are concentrated in the major cities, which regularly experience an influx of immigrants. Along the Canadian border, there aren't really any spikes, and that might be due to the fact that there aren't major cities in middle America along the border.