Final answer:
The Caribbean Community (CARICOM) is the customs union between English speaking Caribbean countries, established to promote economic integration and cooperation among its 15 member states.
Step-by-step explanation:
The customs union between English speaking Caribbean countries, which has established a single market and economy, is the Caribbean Community (CARICOM). CARICOM is an economic agreement similar to a common market that facilitates free trade in goods, services, labor, and financial capital among its members, while also having a common external trade policy. This organization plays a vital role in economic integration and cooperation in the region, coordinating foreign policy and working towards equitable sharing of the benefits of integration among its 15 Caribbean member countries. The formation of CARICOM is an effort to strengthen economic ties within the region and help it to compete with other trade organizations such as NAFTA and CAFTA-DR.