it's true only for Italy, Israel and, partially, the Netherlands...
and even if this tournament has its own rules and features that might differ from any other major competition (Olympics included), it's not that ITA and/or NED can't field a good team with players born in our Countries.
all the Latin American and Asian teams are made of players with really tight connections with their respective Countries (actually, most of them being born in those Nations, where they also learned their basic skills before moving to the Promise Land, aka the USA).
Mexico might look different with a few players born in the USA, but you should know that's an insignificant detail, as they are true Mexicans even if they are born North of the border.
it's always easy to fall on prejudice when people doesn't know how things really are...