Evil aliens have decided to kill everyone on Earth! Fortunately, they've given you two minutes to save as many as you can. All you have to do is name a country to save everyone in it.
The pre-columbian societies in Central America were the Mayas and the Aztecs and, if you include the Caribbean in Central America as if often (though inaccurately) done, then you have the Caribs, the Arawaks and the Tainos among others.
The ancient Maya people were not unified under one polity and had multiple city states, so "capital" doesn't really make sense here. Tikal was indeed one of the biggest sites and led a league of its own, so consider rephrasing the clue to reflect this for accuracy?
Good quiz. (You might check out mine on Panama and the Canal Zone.)