Measuring Time By Yuliana Espinoza Dec 10, 1492 Christopher Collubus found Americas Christopher Columbus sails to the Americas. Dec 10, 1766 China's shang dynasty begin. China's shang dynasty begins Dec 10, 1877 Maya class period begins. Maya classic period begins in Mexico and Central America. Dec 10, 3200 Earliset known form of writing Sumer ians deelop the earliest known form of writing.