In the other side of the world, in the American continent the Maya civilization emerged in the peninsula the Yucatan and the country of Guatemala. As this great society grew in size and culture, it expanded to the north until the valley of Mexico. The Mayan empire seems to be a quite successful creating big construction such as pyramids which require more than 30,000 person-days of labor. Also it was able to to sustain a population of about 3 million. The successes of the empire can also be seen with the invention of a writing system use to record important events in their history. Their knowledge of astronomical events and mathematical concepts can show the success of the empire. The Mayan empire lasted from about the end of the 3rd century
