World history homework help

  Historians are always trying to understand causes and consequences.  Causes

Historians are always trying to understand causes and consequences.  Causes tell us how things happened (or changed) and consequences  indicate the size and scope of the change. One would expect the biggest  changes to have the biggest consequences. What would you say were the  three most important changes that occurred from 8000 BCE to 1450 CE? Why  were they the most important changes? What were their consequences or  effects (up to 1450 CE)? What were their origins or causes?
The great classical cultures of Eurasia created separate identities  but each of these cultures also contained important elements that other  peoples adopted. In the classical and post-classical periods (600 BCE to  1450 CE), the peoples and cultures of this vast area had consistent and  enduring interactions. What were three main causes or sources of this  new integration of Eurasia? What were three important consequences or  effects? What made these causes or sources and consequences or effects  so important?
Three large parts of the world remained separate from the  Afro-Eurasian network. Each had their own experiences and formed their  own networks. In what specific ways did the worlds of Inner Africa, the  Americas, and the Pacific follow or diverge from three broad patterns of  Afro-Eurasian history from 8000 BCE to 1450 CE? What three things can  we learn from the different experiences of parallel worlds?