Why are iPhones cheaper in US than in India?

I think the question is quite clear.
When I saw the US website for the price of say, iPhone SE
In India, (https://www.apple.com/in/shop/buy-iphone/iphone-se/4.7-inch-display-128gb-red)
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which is 614 USD

But, in US,(https://www.apple.com/shop/buy-iphone/iphone-se/4.7-inch-display-128gb-red-unlocked)

it’s just 449 USD
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What are the factors that are in play here?