Because back then no liked blacks sadly
After the advent of Islam in the Arabian Peninsula in the 7th century, Islam started its expansion towards eastern regions through trade encouraged by the development of the maritime Silk Roads. Muslims were known to have a commercial talent notably encouraged by Islam, as well as excellent sailing skills.
Before the panama canal people from East coast of America who wanted to go to Asia had to either sail around south America which took months or sail towards Asia and go around Africa which took even longer. The panama canal was a short cut right in the middle of central America which cut navigation time in half. Hope I helped. :)
Sumer had a surplus of "food", due to the fact that they were an agrarian outcome of the Neolithic Revolution. This meant that people could focus on other activities besides farming. <span />
In order to provide supplies for the war, consumer goods were rationed.
