Atlanta really had to build very few venues. The stadium was one but as noted it was turned into a baseball stadium. Most of the other major facilities were already in place.
Just as many organizations include Mexico as part of Central America. The UN Geoscheme for example.
Others call the region "Middle America". You are so caught up in the cut and dried North/South definition that you forgot to look at the World opinion of what defines Central America.
This went from me giving Nobby a break on his error to you looking like a fool because you were so sure you were 100% right.
1) the Summer Olympics are held - in the summer! And, during the Summer months it can be very hot in South America and in most of Africa. South Africa is a possibility.
You do realize that the Summer Olympics are held during the WINTER of the southern hemishpere, don't you?