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i want to checkout shipping adress, State/Province ("Region") be Required.
Go to Stores > Configuration > General and in State Options group mark all countries for which you wish to require State/Province in State is Required for field.
Stores > Configuration > General
State is Required for
You can set it requried from admin panel. Go to customer configuration and set the preffered fields to required.
you can also manually add a "required" class in your .phtml template file.
Please check it and let me know.
Required, but never shown