Text integration App

I am using the Integration text app. In order for the app to fire the country has to be filled out in the contact record.

These are new leads coming into Infusionsoft from a lead page or landing page. I do not have country as a drop down on my lead forms as I only deal in the US and very locally so it would be silly to have country to choose.

Is there a way to make the default in all contacts United States? I understand I can do a mass updated however these are new leads coming into the application without a country.