Why are Penske based in the UK?
As it is the centre of world motorsport and all other Indy manufacturers are here (incidentally, a new chassis costs 650,000 and engines cost 110,000 each, of which you will need between 11 and 15 a year). England is extremely small, and is actually closer to Reading, Pennsylvania than some suppliers in California. Everything, including the specialist components, can be obtained within a day in the UK. US industry is inefficient when it comes to making things in low volumes, and has difficulty responding quickly enough.