Prior to modern times, all countries were third world, including Europe. Ergo, the statement that no first world country has ever become a third world country remains true. That doesn't mean it can't happen, only that it has not yet.
With present technology, it is impossible for all countries to be first world, meaning that not everyone can succeed at the level Europe and America have in the past and do in the present.
Global population is growing, present levels of agricultural intensity are unsustainable, and global temperature is rising. This is going to lead to a food crisis, and one advantage the US has is that it has a lot more food growing capacity than it needs. Even once declining yields are taken into account, we can allegedly carry more than 400 million people. The old Asian countries have bloated populations much closer to limit and are in much greater danger should yields drop.
If the world becomes one of extreme scarcity, everyone will decline. It is imperative that technology outrun our needs, and the bulk of scientific advancement remains in the hands of the first world. We need every bit we can get, but Brazil cannot contribute half as much as we in the US can.
The scientific output of the US is far greater than that of any other country in the world. Depending on which metric you use, we are responsible for somewhere from a third to a half of all of it.
SJR - International Science Ranking
PhDs use that term.
The UK lost its empire, but it is still a fine place to live. Better than the US in many ways.
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