Why do 70% of CANADIANS live in this little area?

Canada is an extremely enormous country, as a matter of fact, it is the second biggest after Russia. In this manner, its 38 million occupants in such an enormous domain make it one of the nations with the least populace thickness. To get thought, China has a somewhat more modest region than Canada, yet the Asian nation is home to 1.4 billion individuals. The United States has a region pretty much similar size to Canada's nevertheless 330 million individuals lives there, very nearly multiple times more than its northern neighbor. However, what is most striking about Canada is that half of Canadians live in a little region where Toronto and Montreal, the 2 most populated urban communities in Canada, are found. This region dives deep into the core of the United States, to such an extent that despite the fact that Canada is known as a nation situated in the far north, one might say that most Canadians live further south than Americans who live in the provinces of Washington, Montana, North Dakota, Alaska and part of Minnesota and Maine. So the inquiries are: the reason did such countless Canadians settle here, having such an enormous and asset-rich domain toward the north; for what reason didn't huge urban communities create a long way from the U.S. line? Also, how does the Canadian government expect to change what is happening?