Probably not, since basically every ICO out there prohibits US investors from participating, utility or security ones.
Yes very well, in the United States is not allowed to follow the ICO or more precisely prohibited, in fact America will actually make the project ico stronger in terms of funding.
Actually, ICOs are prohibited to US investors, so every ICO can't target the US' citizens, but that won't stop people from participating using VPN, US does not forbid for having an ethereum account or using it, and that is just enough for people to participate, simply put, ICOs can't advertise they are letting US citizens participate, they must make an announcement with specificating US citizens are not allow, but they can't know if one or more are actually doing it anyway, because blockchain makes them anonymous.