I've never heard this. I mean, the Philippines was a U.S. Territory in the 40's. They had pool tables. This is the biggest reason why the Philippines had a big jump on other 3rd world countries as being a pool power house: they had pool tables due to the American influence. If it wasn't pool, it would have been something else that they would latch onto in reference to the OP's post.Realize that well into the 70's pool was almost exclusively an American game. Pool tables found in other countries were located mostly in American military bases. It's no wonder the top players were Americans.
As far as the Phillipines go, they didn't have a ton of great players before Efren Reyes (none that I know of anyway). This was likely because under president Ferdinand Marcos there was hardly any pool/billiard halls in the country - just one in Manila according to John Grissim, author of Billiards, Hustlers and Heroes, Legends and Lies and the Search for Higher Truth on the Green Felt.
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My father and uncles played pool here and there, so they musn't have been uncommon. I don't see how it follows that Ferdinand Marcos would somehow ban or be the reason for the removal of pool and pool tables. Even though he was a dictator, he still liked fun.
Maybe Grissim had trouble finding one when he was there, similar to when it was tough finding one here in 1982.
And there were a bunch of good players from the Philippines before Efren. Jose' was just the first that America ever witnessed playing. Jose' obviously had to learn somewhere.
Fred