The Senate refused to ratify the treaty of Versailles primarily because they objected to the League of Nations. If the US joined the League, then they would be obligated to fight in future wars and the Senate didn't want that.
The Toltec<span>, who dominated </span>Meso america<span> from the 10th to the 12th centuries, adopted many features of the preceding cultures, including the Teotihuacán and Olmec civilizations</span>