Here are the steps to create a discount rule to apply discount based on customer's shipping address. For example, store owner offers 25% discount for the customers coming from the country United States.

Step-1 : General tab

Step-2 : Condition tab

Now you are on condition tab where select Shipping country in list as type and choose United States (US)  in the value dropdown.
Click Next.

Step-3 : Discount tab

Choose Percentage discount as discount type and give 25 in the value text box.

Step-4 : Frontend demo

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