Load balancer with multi region

I have application www.filesdna.com that serve multipleregoins, and according to GDPR and data location rules, i need to create multiple storage for each region.
My question is :if i create Backend servers for each region and assign the storage for that region , how i can be sure that users from that region will be sent to the servers for that region in the loadbalancer?
My regions are:
USA : 2 back-end servers+storage
Europe : 2 back-end servers+storage
UK: 2 back-end servers+storage
Australia : 2 back-end servers+storage

Regards,
Mo

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