It's mostly people just rating their own lives, which leaves it open to people in different cultures reporting the same actual happiness differently. In some cultures, saying you're happy is bragging, so people understate. In others, rating it low is complaining, so people report overly happy.

I see World Happiness Report as primarily a measure of what's considered the most socially acceptable way to discuss happiness across cultures. In the USA, people often brag about how miserable they are, for example.

It's not all about finance. From my recent visits to Mexico everyone there seems much happier and friendlier than in the US and Europe. It was honestly quite striking. I have no theory what causes this (maybe large families?), but it was really quite obvious.

Mexico is finally shedding their neoliberal order and getting stuff built and people taken care of (instead of foreign investors). President Sheinbaum has like an 80% approval rating.

Actually two.

I would be surprised if their ranking would be increased if any of these were addressed.

What high crime? I'm assuming we're using the US as a reference here given the audience of this site.

Crime isn't high. No real risk of random violence in my experience (unlike the US, e.g. >weekly school shootings etc.). Taxes and economy, they aren't good right now true.