NOT EXACTLY!!!!!!!!

Roster for the USF2000 Series - Level 1 of the ladder structure to Indy Car Series
15 drivers>>>LINK
USA - 9
Canada - 1
Australia - 1
Ireland - 1
France - 1
Columbia - 1
Finland - 1

Roster of the Star Mazda Series - Level 2 of the ladder structure
18 drivers>>>LINK
USA - 9
Puerto Rico - 1
Canada - 2
Ireland - 1
France - 1
Brazil - 1
Venazuela - 1
Columbia - 1
Chile - 1

Roster of the Indy Lights Series - level 3 of the ladder structure
17 drivers>>>LINK
USA - 4
Canada -2
UK - 2
Ireland - 1
Norway - 1
Argentina - 1
Angola - 1
Brazil - 1
Venezuela - 1
Mexico - 1
Columbia - 1
Spain - 1

Roster of the Indy Car Series
26 drivers>>>LINK
USA - 7
Canada - 1
UK - 2
Scotland - 1
Australia - 2
New Zealand - 1
Brazil - 5
Switzerland - 1
France - 1
Spain - 1
Japan - 1
Columbia - 1
Venezuela - 1

Not quite as skewed to foreign drivers as many think especially in the development series.

Hmmm!!! Are the Canadians close enough to America for you?

How about Puerto Rico(US territory), the UK, Scotland, Ireland?

How about Australia and New Zealand where US sprint drivers sometimes go to race in the off season?

HMMMMMMMMMMM!!!!!!!!!!! -- As JackWebb used to say, "Just the facts ma'am!"