Social Studies Timeline By Gabriel García Mejuto Period: 250,000 BCE to 3000 BCE Prehistory 4M years ago appear human beings Period: 3000 BCE to 476 Ancient age Appearing of writing in Mesopotamia Period: 1 BCE to 1 CE The year 0 Period: 476 to 1492 Middle Age The Roman empire falls Period: 1492 to 1789 Early Modern Age The europeans arrive to America