If you want to be convinced otherwise, just look at some Gates Foundation† reports: non-first world is progressively getting better in basically every possible

If you want to be convinced otherwise, just look at some Gates Foundation† reports: non-first world is progressively getting better in basically every possible metric, and the fact that they're not at first-world levels yet is a non-sequitur. † or whatever else report on the situation should you ever hold some disdain about Gates stuff.