Reason for why the US is so different in standards than everyone else?

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So TIL that most of he world uses a five continent system. I think they said Latin America uses 6 but I don't know if they change, but it seems most of the world uses the 5 continent model, which makes more sense to me. I was wondering why has our way of measuring and general eductation so different than it seems everywhere else in the world? Is it more of us just having a dominant media prevalance and so we are allowed to go with our own way? It just seems so confusing and backward that we don't adopt useful systems like metric. Ever since I started cooking, it's been irritating doing ingredients in cups, lbs, oz, tbs, etc... when it would be a lot easier to do g and mL