They have the quarries. They have the tools. They have the causeways. They have the workers' houses. They have even built little pyramids to test the techniques for shaping, moving, assembling, and facing stones for the real ones. So what part of that requires aliens?
Or let's look at it another way: if aliens and super-advanced technology were involved in building the pyramids, why did it it take decades to get one up, and require housing, food service, etc., for thousands of workers? And how did they screw up so bad on the Bent Pyramid?
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