Joshua did send an army and he had chose 30000 of his best soldiers and they were sent at night<span />
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>Hitler and his henchmen victimized an entire continent and exterminated millions in his quest for a co-called "Master Race." But the concept of a white, blond-haired, blue-eyed master Nordic race didn't originate with Hitler. The idea was created in the United States, and cultivated in California, decades before Hitler came to power. California eugenicists played an important, although little known, role in the American eugenics movement's campaign for ethnic cleansing.</span>