PGA and Euro Tour events are counted equally in the world golf rankings.
Again, as I have noted before, where are these Europeans that you're talking about? Golf now--as it has always been--is dominated by the UK and the US; there are good players from former colonies, but that's always been the case. You are just seeing more of them now because travel is easier now than it was in the past. Players from far-flung countries can now more easily play more majors on US soil.
To wit: there is one good European player, and that's Kaymer. Other than him, please name one consistently good European player. They simply don't exist.
Lee Westwood held the #1 standing before Kaymer. But it goes beyond Europe per se. Choi. Els. The Aussies. And yesterday we had a South African win. The first (to the day) in 50 years. We’re seeing World class players from around the globe. Sure, Els is aging, but he can still be ranked with the best.
Yesterday, of the top 15 finishes, we count 6 Americans, 13 foreigners. And except for Tiger tied for 4th, the balance finished tied for 8th place or beyond. If you don’t see that as a weakened American field, I can’t help it. But I do, and I don’t like it. At all.
Let's look at it this way. From the PGA leaderboard for the Masters, taking my own count:
Total contenders:99...46 Americans, 53 foreigners.
Made the cut: 21 Americans, 28 foreigners
Missed the cut: 25 Americans, 25 foreigners
Foreigners had 28 of 53 players make the cut (53%). Americans 21 of 46 (46%). 54% of all who were eligible to contend for the cut were foreigners.
That's what I'm getting at.