"The United States" is not a target market.
Demand, competitor density, click prices, seasonality and even licensing rules change from state to state. A campaign targeting the whole country blends Manhattan and rural Montana into one average cost per lead that no one can act on, and the algorithm quietly spends where clicks are cheapest rather than where the customers are. WIF starts from the states and metros where the offer already converts, gives them separate campaigns and separate USD budgets, and only expands once a state has proved a cost per qualified lead on its own. That structure also makes it possible to hand the sales team a geography they can actually staff, instead of leads scattered across three time zones with no coverage plan.