Consequently, the massive arrival of the Europeans in these areas began, which enabled the emergence of new settlements, and today they represent the big
metropolises. In 1812 a new conflict broke out in the Great Lakes region, which lasted two years . This was America’s last attempt to take the northern part of the lake. The number of inhabitants in the Great Lakes basin varies due to the different methodologies used in the sorting of populations in metropolises and urban areas that are within the hydrological boundary-basin or the Great Lakes Basin. The estimation of the number of inhabitants in the Great Lakes basin amounts to 33.4 million from 1991, the total of the United States with Canada. A special problem that arises when determining the number of inhabitants in this region represents the metropolitan area of Chicago where changes in the hydrological characteristics of the basins are marked.
In recent years, compared to the previous one, the population of the Great Lakes is characterized by a lower growth compared to the rest of the US and Canada. While the population of the United States and Canada together grew by 22% (from 225 million to 275 million), from 1970 to 1990, by the population hydrological basin of the Great Lakes has grown by less than 1%. This disparity in population growth rates indicates redistribution in regional economic activities in relation to industrialized regions. The Basin loses the population in favor of the new expanding region. In this part of the US, migration of the population in the south and southwest is characteristic. Both sides of the border, the United States and Canada, are distinguished by different population trends. Ontario, with more than one-third of Canada’s population, is characterized by twice faster population growth than other states located within the Great Lakes basin. In Canada and the United States, there are many similar changes in the age structure.