Is it true that only millionaires or wealthy businessmen can immigrate to the United States and Canada?

No, this is a misunderstanding of immigration by many people. Take Canada as an example. Canada has a rich immigration policy. Every province has its own immigration policy. Generally speaking, you need to have study experience in the province before applying for immigration. You can also immigrate if you meet the industry scoring standards in the list of skilled immigrants in the province. For example, in Quebec, you can immigrate as long as you study in Quebec and then have French scores. You can get immigration status in 3-4 years at the earliest.