Our country, the USA, is dedicated to the Immaculate Conception, however, so we can keep praying that our country slowly turns back to Christ and Mary.
With the influx of Catholics from Mexico there is a great dedication among them to Our Lady of Guadlaupe -- so maybe we are on our way!
When the Bishop Zumárraga saw the Image of Our Lady of Guadalupe on St. Juan Diego's tilma, he said "It's the Immaculate One." So technically, you can say that Our Lady under the title of the Immaculate Conception is the patron of the U.S. and Mexico. ;-)