A free-trade agreement occurs when all participating nations are able to trade with each other without having to pay tariffs.
For example, NAFTA (North American Free Trade Agreement) established by President George H. W. Bush allowed the participating countries to trade without paying tariffs.
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Well history does show us some pretty cool heroes and some pretty bad villains, but some stories from history are not real for example Poseidon god of the see in Greek myth. Greek myth can be counted as part of history.
What period are you talking about?