The World Happiness Report uses six factors as predictors of life evaluation: GDP per capita, social support, healthy life expectancy, freedom to make life choices, generosity, and corruption.
Because we are better than most countries by these metrics
Just wanna point out to the thread in general that this isn’t just surveying a bunch of people asking “on a scale of 1-10 how happy are you?”
Edit: the video linked actually doesn’t make much mention of the survey mentioned in the headline.