Field Values for Search Box

I have a view that I am using for searches. One field is Country, and the other is State. The values for these fields are populated using @DBColumn. However, what I want is that, pending on what the user chooses for their country, the States get populated in reference to the Country chosen. For example, I choose United States for the country, I only want to see States from the United States in the “State” field. I am not sure what the best way to do this is.