Meaning "rightly guided," which empire began when Muhammad died and controlled over three million square miles of land?

When Mohammad passed in 632 AD, this religiously governed Caliphate took over to hold his empire. Meaning "rightly guided," the Rashidun Caliphate had taken six percent of the world's landmass (over 3 million square miles) at the height of its power, and its people were allowed freedom of religion.

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