yes i know the awnser to this but first you have to awnser one of my questions
The first four Caliphs were Abu Bakr<span>, </span>Umar<span>, </span>Uthman<span>, and Ali
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If the government never had separate the power into three branches the government would've been anarchy government who would be greedy to share his powers to the citizens and he would ignore the concern of the citizens.
built the Great Pyramids
developed advanced irrigation
expanded the empire’s territory
improved trade and transportation