In a Magento 2.0.7 with very little customization when we disable a country in
State is Required for in
Stores -> Configuration -> General -> State Options the state field in the checkout process shows up as non required field for this country. However, when we try to proceed without selecting a state this is not possible and we get the error message
Please select an option.
below this field. If we select a state we can proceed.
Also worth mentioning, the
Allow to Choose State if It is Optional for Country option has no noticeable effect for us.