Before the Filipino Invasion, with Jose Parica leading the way, it was the Mexicans who were the toughest ones to beat here in the States. There weren't as many Europeans, Asian Pacific Islanders, and Brits who frequented the tournament trail in the States.
Today, pool rules in the Philippines. Mexico has its own sports culture, the popular ones being quite different than those popular here in the States.
Look at the entries into the U.S. Open in the late '70s and early '80s era, consisting of 40-plus players, the majority of them being American. Today, the U.S. Open enjoys a full field of 250-plus competitors, and though Americans may still be the majority in entrants, there is an international flavor in the fields of today's tournaments on American soil.
JAM