Because most Latin American and Caribbean countries share a similar colonial past(colonies of European countries like England, France, Spain and the presence of slaves) A few food items such as plaintain, chicken, pork, rice and beans, avocado and so forth are common in their respective cuisine. The interesting scenario is that while they are common, some countries can be considered as the point of reference and master in cooking them and also for their unique presentation of the cooked common food item.
For example: Meat and pasta are your thing? then Argentina is your playground. Handmade pasta is a common and exquisite dish in the country of Tango. Juicy and tender steak is also a true delight.
If juices and vegetables are what you are after, Brazil is your territory. This country has a way of making the most boring fruit or vegetable into a finger licking and picture worthy dish or drink. Some of the best examples are : Stir fried Okra, hearts of palm, sauteed mirliton (also known as Chayote or mango squash). Avocado juice, acerola( of the same family of cherry), passion fruit mousse.
Like fish soup? Then Colombia is happy to entertain your palette.
Pork is your favorite meat dish? Cuba is your answer – Anyway you want it: fried, gried or in stew.
Finger licking oxtail and interesting cod fish recipe or rum cake? Jamaica is your destination.
Rice and beans, plaintain, conch in a cashew stew are on your food item “to try” list? The cuisine of Haiti is your one stop culinary destination.