How Was the Great Pyramid Built So Quickly?

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The Great Pyramid of Giza was built in a remarkably short duration of time, likely between 20 and 27 years. How was this accomplished?

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Introduction

Without the use of pulleys, wheels, or iron tools, the Great Pyramid of Giza was built in a remarkably short duration of time, likely between 20 and 27 years. How did the ancient Egyptians accomplish this feat?