Grenada was important for the same reason that the Third World is important. It has become fashionable among some analysts to downplay the importance to the United States of the Third World in general and of small Third World countries such as Grenada in particular. According to this viewpoint, the United States should have a clear list of "vital interests."
Coll, Alberto R.
"Why Grenada Was Important,"
Naval War College Review: Vol. 40:
3, Article 2.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol40/iss3/2