Check this: https://www.inmotionhosting.com/support/edu/prestashop/block-a-country/
It's for PS 1.5 but it's similar in PS 1.7.
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Check this: https://www.inmotionhosting.com/support/edu/prestashop/block-a-country/
It's for Ps 1.5 but it's similar in PS 1.7.