Olmec Vs Aztec Civilization

The Olmec civilization, which flourished in eastern Mexico from about 1300 to 400 B.C., was probably the forerunner of several other Central American civilizations, Such as, the Toltec, Aztec, and Maya. The Olmec practiced advanced agricultural methods, but they were also accomplished engineers. For example one of their gifts to posterity is a group of sculpted stone heads, each weighing more than 20 tons. Although the purpose of these monuments is not fully understood they attest to the artistic and technical skills of a people living in the Americas some 2,500 years before Columbus. Even more interesting is the fact that like the ancient Egyptians the Olmec developed a sophisticated method of writing based on their own hieroglyphics. Strangely