They made Channels underground a lined with clay to prevent sepage in the surrounding soil. They were a big contribution and we still do something inspired by that today.
Answer:
I dont know if you were trying to add a multiple choice or trying to respond to someone but its
Explanation:
This was during the Cold War and Fidel Castro was a Communist (America as a whole did not like Communism and Communists * cough * Soviet Union * cough*) and since Cuba is right off the coast of the USA they were worried about nuclear weapons and missiles (The Cuban Missile Crisis) they tried (and failed) to overthrow the Communist leader.
