That may explain some. However, they tend to have the same geometric dimensions or ratios. Many people don't realize the Egyptian pyramids have eight sides. This too is a recurring theme. We don't know if this applies to the earthen pyramids (erosion), which are all over the world, including here in North America. All of these cultures speak of at least some of their gods having white skin and facial hair. This is certainly true in South America. Some artifacts are also decorated having blue eyes, in addition to white skin and facial hair. Likewise, in many of these ancient cultures the swastika also appears. This is true everywhere, including China and Japan. Additionally, many have the same stellar alignment as well as common location attributes. All of which implies a common global civilization prior to the Great Flood (Younger Dryas Event). This is only some of the reasons they gatekeep anthropology, archeology, and egyptology.