Maybe because other countries do not play baseball? (Except japan Canada Cuba and a few other island countries)

The UK and Ireland had cards representing Premiership soccer players. You would buy a book in which to collect the cards and the goal was to fill in every player on every team in the league.

The cards were sold in packs of ten or something, and kids used to trade them with each other in the playground.

Yeah, we had Italian Football player cards because Italy loves football.

Uh, you're forgetting a few hundred million people in South America and Korea.

> Baseball cards became a thing because Americans already had too much money.

This reminded me that I should start collecting the Panini stickers for the upcoming football World Cup. The only issue is that I've read recently that they doubled in price and I had a hard-time convincing myself to throw money their way even they were cheaper, much less now, with the current price. Which is a shame, because I first collected World Cup Panini stickers 25 years ago, when I was a kid.