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I think the hardest part was cutting the stones with no iorn or steel.

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I think the hardest part was the danger of the mountains.

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The hardest part was probably the fact that they were far away from other civilizations so it would be really hard to trade or meet with other areas.

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i think the hardest part was the danger of the mountains, and i think maccu picchu was made as a last resort type of place

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I think the hardest part was that they were living in a place for travel to be so hard, so trading with all other communities for resources would be extremely difficult.

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I think that the hardest thing was probably finding a spot to put a house or a farm or whatever and also gathering resources.

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I think that the hardest thing is that they would have to be completely self-sufficient on the mountain because there would be no-one that knew you were there, so you wouldn't be able to import items from other countries.

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I think the hardest thing was how little people there were there where only around 5300 people.

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I think trade you be irrelevant. so no

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They had to dig the mountain flat in order to build their homes. They made the walls sturdy in order to keep them safe from earthquakes.They had plenty of spring water, but they had to dig trenches to get their food to grow.It must have been pretty cold up there in the mountains.

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I think the food would be very scarce.