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Its not where they’re grown. Over the last few decades tomatoes have been engineered for looks, shelf life and durability during transport. In the process many of the traits producing good flavor (sugar content and various aromatic compounds) got removed.
Go to your local farm stand, grow them yourself, and they still don’t taste like they used to.
The main driver was the push for yield after WWII. There are still seed varieties that produce old style flavors to grow on your own, you just have to be willing to do trial and error. When you find one that works, make sure to save the seeds for the next year. And there have been studies done on this phenomenon and some seed developers are trying to engineer fruit with the correct balance of sugars and acid components (see the link).
My father has been saving recycling his own seeds for almost 50 years. I don't notice a difference between his and mine.
Out of flavour: why tomatoes have lost their taste
After exhaustive studies, an international team of scientists has worked out why tomatoes don’t taste like they used to