Two major invasions in the 500s and 300s BCE caused the Indian kingdoms to unite - the Persians invaded the Indus Valley in the 500s BCE and Alexander the Great invaded in 327 BCE. The two major empires that united India were the Mauryan Empire founded by Chandragupta Maurya in 321 BCE and the Gupta Empire founded in 320 CE by Chandragupta. The greatest ruler of the Mauryan Empire was Asoka, who was a devout Buddhist and contributed by building hospitals, roads, and promoting Buddhism and tolerance of Hinduism. The Mauryan and Gupta Empires contributed to literature, mathematics, science through Buddhist teachings on stone pillars, writings like the Ved
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