U.S. Market that Ships to International Addresses

[mar17]

My store currently has two markets, the US and Mexico. Every time a customer purchases in Mexico, the currency changes to MXN pesos even though my currency has been set to US dollars. To avoid this, I want to eliminate Mexico from my markets and just keep the US; however, when I do this, it doesn't let my customers in Mexico input their addresses. Is there a way to only have the US Market, but still have access to inputting Mexican addresses?