Grenada is the only Caribbean country which holds the coveted E-2 visa treaty with the US, allowing citizens to apply for a non-immigrant visa and reside there. This is a great chance because many nations, like China, Russia, India, and those in the Gulf, do not have an E-2 treaty with the US. You may apply for a USA E2 visa after obtaining Grenada citizenship.
The best low entry way to get a second passport is through the Grenadian citizenship program, which requires an investment of $300,000 in real estate.