In a controversial statement this week, President Donald Trump highlighted Norway as the kind of country from which he'd like more emigrants to the United States. Many residents of Norway politely declined, according to Reuters, likely because "the Nordic country, one of the richest in the world by GDP per capita, was last year named the happiest nation on the planet."

Indeed, according to the United Nations' latest World Happiness Report, as covered by CBS News, the top 10 happiest countries are:

1. Norway

2. Denmark

3. Iceland

4. Switzerland

5. Finland

6. Netherlands

7. Canada

8. New Zealand

9. Australia

10. Sweden

Those countries have one interesting thing in common: They're all highly taxed.

That's not a coincidence, says report co-author Jeffrey Sachs, who is also the director of the Sustainable Development Solutions Network. He tells CBS that "happiness is a result of creating strong social foundations," and that if other nations prioritized "social trust" and "healthy lives," they could also find that their citizens become more content.

The top three happiest countries, Norway, Denmark and Iceland, are all among the highest taxed countries in the Organization for Economic Cooperation and Development (OECD), in terms of total tax revenue as a percentage of GDP. The widely enjoyed social benefits residents get in exchange for their taxes, such as universal health care, access to education and subsidized parental leave, could have something to do with the "strong social foundations" touted by Sachs.