TIAHUANACO and the RUINS UNDER LAKE TITICACA WERE BUILT WHEN THE ANDES WERE AT SEA LEVEL
There are ancient terraced corn fields on the sides of the mountains rising above Lake Titicaca. The highest of these terraces will not germinate or grow corn. Corn will only germinate and grow up to a certain altitude.
The lower altitude terraces where corn could still grow are still at a level above Lake Titicaca. This means that the "pre-historic" peoples cultivating corn "lived" in the area "before" and "after" the numerous necessarily cataclysmic crustal deformations and uplifts that raised the Andes. The cataclysmic uplifts caused the terraces where the corn "was" successfully cultivated to be raised to an altitude where the corn would not grow. As the mountains rose cataclysmically the peoples terraced their cornfields successively lower down the mountainsides. There is a stone causeway leading "out" of Lake Titicaca. It has been speculated by some of your archaeologists that the area used to be at sea level and the causeway led out to the Pacific ocean. The causeway now leads out of the lake to nowhere at 9OOO feet altitude.
There are stone "ruins" more "ancient" than the stone causeway leading out of Lake Titicaca. These "ruins" are buried under six feet of "sediment" on the shallow "bottom" of Lake Titicaca. The sediment contains "pre-historic" (more ancient than 12,OOO B.C.) sea shell fossils. There was not enough topsoil on the peaks surrounding Lake Titicaca to have "eroded" down and "covered" these "ancient" ruins with six feet of sediment.
The six feet of sediment covering the "ancient ruins" around and under the present "water level" of Lake Titicaca was probably deposited by the "Biblical Flood" before the existence of Lake Titicaca.
The huge Flood happened "pre-historically" when the land around Lake Titicaca was closer to sea level.
With this data in mind, any person with a modicum of intelligence can understand that Earth's ancient history has been clouded over and geologically changed and this tends to protect certain interests at the expense of the common people who live here on Earth.