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Because of trade. The trading that was between them caused their ideas to spread.
Trade
People who fought wars spread new ideas to other civilization. And also the nomadic people who used to move from one place to another.
Rome and Greece
One consequence of ideas exchanged between ancient Greece and Rome is that the Romans would copy Greek's art and architecture
The Middle East spread their ideas by warfare and conquests
The Middle East spread their ideas by warfare and conquests
In ancient Greece ideas were mainly spread verbally. People talked about them.
The middle east spread their ideas by warfare and conquests
trade
using events from the history in the united states and Canada identify 3 examples of the spread of different ideas or information
Of course ancient Rome's political ideas spread. They carried their politics with them all over the empire. After the dissolution of the Roman empiretheir legal concepts remained and today form the basis of many western laws.
Contributing to the faster spread of ideas.
the Renaissance
Travel and marriage spread renaissance ideas, By when you married you would spread ideas to you kids and spouse, and when you travel you spread it where you go
Greek philosophy spread after being conquered by the Romans, and then the Romans spread the "improved" Greek ideas around their territory. Sometimes Roman philosophers agreed with the Greeks thoughts, and sometimes they highly disagreed.
Ancient India got some ideas from ancient China.