There were many achievements that the Persians made. I found quite a few interesting facts on the things they invented. Some of them are cement, brick, roads, the numerical systems and some studies in chemistry. They made roads before the Romans did! The Persians also invented some parts in music as well.
Sumerians were attacked by outsiders because they didn't have a body of water or something similar bordering it to protect them from people getting in so easily unlike Egypt.
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