Explain What Contributed To The Formation Of Empires

The formation of Empires
An Empire is a group of states or different ethnic groups brought together under a single sovereign power. They have varying degrees and types of centralized distant regions through common languages, unifying political systems, trade and shared religious beliefs (Pollard, Rosenberg, Tignor). But what contributed to the formation of Empires?
In 1200 BCE a horrible long drought occurred and affected population growth and exhausted the soil in Afro-Eurasia, the Mediterranean and East Asia. The drought forced settle societies with already established governments to migrate to fertile lands. The migration disrupted the urban societies and the administrative centers, kings, priests and dynasties. Invaders from peripheral societies also disrupted trade and diplomatic relations. They took advantage an assaulted the urban centers and many of the powerful states collapsed. The migration helped the new Empires develop but only after

People could not survive the long distances needed sometimes for trade. But the use of camels helped to make the long distances needed. Boat were also used in river and lakes for trade. New technologies in ship building with better reinforced hauls, stronger masts, riggings and sails made the wind power more effective and could go longer distances. Then the improved on ballasts and steering helped mariners venture out into the open sea of the Mediterranean. New metalworking helped to create a harder iron. Iron helped to revolutionize agrarian techniques. The iron was used to build the forged-iron-edge plow that allowed farmers to cultivate crops far beyond the floodplain of the riverbanks. Farmers could now till land that had weeds or was dry from the drought. The iron plow made short work of the dry soil and broke up the sod to reveal the fertile sun soil. This meant more lands could be worked to produce