Mexican wrestling is more gymnastic with an emphasis on flips and high-flying acrobatics than on impact on the opponent.
Japanese wrestling is more like an actual athletic competition between two guys who look like they're legitimately trying to hurt each other.
American wrestling is more about the story that surrounds the match than the match itself. Style-wise it's somewhere in between the other two with elements of both.
Granted these are pretty broad generalities, as there are aspects of each that can be found in all three.
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