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God Bless America is referring to the United States of America in specific. If you'd like to bless the Mexicans, say God Bless Mexico :)
God Bless America Again was created in 1972.
God Bless America - album - was created in 2001.
God Bless America - film - was created on 2011-09-11.
God Bless Miss Black America was created in 2003.