Syria was developed by the Phoenicians, Greeks, Romans and then Byzantines, Persia was an empire and had thousands years of history and culture. Egypt was the cradle of civilization for thousands of years before Arabs took over. Spain was Roman province with very sophisticated infrastructure left by the Romans
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The civilization of the Persian Empire was mostly created by others (Babylonians, Syrians, etc.) before the Persian Empire was created. The Persians were good at ruling a large empire but their cultural contribution seems to have been limited.