1) traders might be attacked by other civilizations and looters
2) They may disagree upon the pricing and the worth of traded items
3) One may want to get rid of a item, another may not want to buy it, resulting in hatred and eventually war if it becomes too 'aggressive'
hope this helps
<span />For the answer to the question above,
Wilson asked Congress this question when he presented
<span><u><em>c</em></u><u><em>. the Treaty of Versailles </em></u></span><span>to them in July 1919.</span>I hope this helps. Have a nice day!
Answer:
you will need ask someone if you are doing it because if you make a mistake they can help you