Original sentence: Hapgood argued that owing to the map being assembled from components, the Caribbean section was rotated nearly 90º from the top of South America.He attributed this to either copying from a polar projection, or to fit in the space available by hinging the map at that location and giving it an "alternate north", of which other examples are known in maps of the era.He supports this with an analysis of the mathematics of ancient maps and of their accuracy, which he says surpassed instrumentation available at the time of the map's drafting
Edited sentence: Hapgood argued that owing to the map being assembled from components, the Caribbean section was rotated  nearly 90º from the top of South America, perhaps due to copying from a polar projection or to fit in the space available by hinging the map at that location and giving it an "alternate north" which was known of in other maps of the era.He backs up his claim with analysis of the mathematics of ancient maps and of their accuracy, which surpassed instrumentation available at the time of the map's drafting.However, he did not dismiss either Continental Drift or changes in the Earth's rotation as possible events to explain the lack of ice at the pole.In an earlier publication, The Path of the Pole, not related to his map researches by himself, Hapgood was inclined to the opinion that the Earth's crust has rotated in recent history (around 9,600 B.The same claim has been advanced by Erich von Däniken and Graham Hancock, to support similar beliefs in the existence of civilisations during the last Ice Age.This is not so much of an Achilles heel as some critics make it to be as the idea of continental drift did not become widely accepted as theory until the 1950s in Europe and the 1960s among North American geologists, and is far too slow a process to account for the dramatic changes that ostensibly took place.it is claimed)