The three principal ways civilization spreads from one region to another is through trade, travel and warfare. When people travel, they bring with them goods from their region to another and this would be the start of contributing and sharing, and trading their ways and ideas of growing crops and raising other goods. It can also be spread through wars. Through this, different relationships emerged.
Germany have begun construction on the Berlin Wall
Organizing events in the order they occured is relative chronology. The answer is A. Relative chronology is used by Historians and Archeologists to show the timing of certain events as they relate to other events. Basically what came first then what came after.
