Yes, but you never know how things are interconnected these days. US isn’t directly exposed to Greece, if this ends up being worse than expected for german banks, and us and businesses are invested in german or other european banks, here could be a ripple effect.
Possibly, but unlikely. The US has been getting out of anything Greece related for months now so their liability is small. As to others, Germany mainly, they have been investing in Greece for years and are not going to lose their butts. This also applies to others in the Eurozone as they have gone along with this... Too bad!