Belgium and France rank below the US [2], Monaco is not listed, the other 4 are close to the US, except the Netherlands.
Also, Monaco (population 38,000) has the highest number of millionaires and billionaires per capita in the world. They're not the usual workers and union type of country.
I suppose you mean the Nordic countries are happier as a group, which is true, but World Happiness Reports explicitly do not list your reasons as the cause of Nordic happiness [1], instead listing other factors.
Do you have a source showing their happiness is caused by the factors you listed? I can find none. All list things like lack of corruption, belief in government, etc., as the reasons for their happiness.
[1] https://worldhappiness.report/ed/2020/the-nordic-exceptional...
[2] https://worldpopulationreview.com/country-rankings/happiest-...