In Hammurabi's Code document it gives laws about how to govern onself while cultivating land so it looks like most people made money in the country as peasants with the exception that when Babylon was first founded in about 1900 BC is was primarily a city-state with very little adjoining area for cultivation so initially the citizens probably made most of their money in the city.,
Basically this:
AH asks Germany if they'll defend them, Germany says yes thinking it won't have to deliver on that promise
AH Forces Serbia into war, Russia hops in to defend Serbia
Germany, following through on it's promise, also declares war on Serbia.
Russia assures Germany that it's only mobilizing on AH
France is allies with Russia, but doesn't join the war.
Germany get's paranoid that both France and Russia will invade it since Germany boarders them both, decides to go to war with both of them just in case.
Germany and Russia are now at war.
A nomad is someone who travels on and on for fresh pasture for farming etc anyways it relates to the spread since they would go from place to place telling people about Islam spreading there religion far and these nomads would tell other nomads and those on and on it was easier to spread than villages since villages are closed up and people don't move but the nomads are constantly moving people