What was common between the early civilisations of india china mesopotamia and egypt?

What does the man of the left represent? what does the men on the right represent? why is there a hat on central and south america?

Why is it useful for historians to base certain studies on the analysis of historical themes

Which of these did the soviet union do in 1961? it built a wall through berlin to keep people from moving to the west. it used force to destroy a wall the united states had built in berlin. it convinced the british and french to merge their zones in berlin with the soviet zone. it threatened to bomb berlin if the united states did not leave within 30 days.