Which nations have high standards of living?

Canada and the U. S.

Mexico and Greenland

Mexico and Canada

the U. S. and Greenland

I feel like this question is asking for U. S and Canada, but to be honest, this question is a little biased. Both countries have some social problems and excluded groups for which the standard of living is low; and there is a lot of income inequality which leaves many people in desperate situations.

Yet, U. S and Canada have for example longer life expectancy than Mexico and Greenland.