why dont so many people have houses, when there are affordable foreclosed homes?

I recently discovered about the foreclosed homes for sale and i was really surprised to see the prices of them. It was between 100,000$ -150,000$ , which are not so bad at all for those houses. So i was wondering why are many Americans ( i am from europe) losing their houses and cant buy those affordable ones? OR there are many dangerous scans with foreclosed homes? Is it safe to buy a house based upon online websites of foreclosed homes? ( of course, we would talk and meet with those people in person)

Thanks for the opinion!

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