ARLINGTON HEIGHTS, Ill. – In the past five years, European invaders have won seven of the 15 Grade 1 races on the Arlington Million programs, and they are 1 for 1 in the new American St. Leger Stakes. International shipping no longer presents the imposing hurdles of the past, and overseas connections have become increasingly savvy about choosing horses that will fit American races. Fourteen Europeans are bedded down in Barn 28 on the Arlington backstretch this week, and it will be surprising if several of them don’t prove to be major players Saturday.