Civilization spreads from one region to another is by trade, travel, and warfare. People traveled carrying goods from one region to another and would tell others about new ways of growing crops, making things, and living together. They traded ideas and skills. Although trade brought people into peaceful contact with each other, civilization also spread through wars. For example, when Sargon and the Akkadians conquered Sumer, Akkadian became the language of government. But the Akkadians started to use Sumerian cuneiform writing. :)