Have you ever lived in an actual third world country? Here’s some from my home country for each of your examples:
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Corruption in government is worse and more blatant than what you see in the US. It happens at the top all the way down to the lowest levels. You sometimes have to bribe people just to get some services done. I once had to have a police report done for an auto accident. The officer had the report typed up and they just needed to click the print button. He then said I can pay a quick process “fee” to get the report now, or come back to get the report in 3 days. It was an hour drive to the station, but I didn’t want to pay a bribe, so I came back after 3 days.
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Infrastructure is crumbling not just because of lack of maintenance, but because the cheapest materials are used and infrastructure is not built up to code. Every step of the process means a cut for someone’s own pockets, so you end up with a tiny amount compared to what was initially funded. Perfectly functioning roads are destroyed and rebuilt in perpetuity because contractors are in cahoots with local government to implement “projects” where they fleece funds by agreeing on a budget then switching materials to substandard quality and pocketing the remaining amount, with the politician getting a % of course. A section of the street in my childhood home is still unpaved 30+ years later just because no one bothered to finish it.
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Homeless people in the US may still have access to food banks, shelters, charities, etc. Homeless people in thrid world countries may have nothing at all.
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People lose power in the US due to catastrophies. We had random 12 hour blackouts and water shut-offs several times a month for no reason at all. Water isn’t potable in the entire country and you have to boil or buy water from filter stations if you want to be safe.