After the vietnam war was over, what countries fell to communism?

After the Vietnam War was over, the countries that fell to communism were Laos and Cuba.

Explanation:

Towards the end of the Vietnam War, the mandate was given into the hands of the Communist Party of Cuba by the people of Cuba. Cuba served as a communist regime for a long term after that. Laos became a communist state after taking down the monarch and establishing a communist regime in the year 1975.  

Communism refers to a political ideology in which the all the property is owned publicly and people should be paid according to their necessity and their need.