Explain the advantage of an east-west continental axis in Guns, Germs, and Steel.

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In his 1997 book, Guns, Germs, and Steel: The Fates of Human Societies, Jared Diamond explains that the advantage of an east-west continental axis is that food production (agriculture and herding) spreads much more rapidly and effectively along it. Simply put, advancements in agriculture, animal husbandry (domestication), and technology—all things important to food production—could spread much more easily among people living along the same latitude (in a continent that spans east-west) than among people who lived at different latitudes (in a continent that spans north-south). This is because your latitude determines things like the length of your day, what your seasons look like, and even the biosphere you live in. Again, these are all things very important to food production. People who lived along the same latitude could spread advancements to one another more easily than people who lived at different latitudes and had to adjust to wildly different surroundings.

Why was food...

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