Countries of US addresses showing up as Foreign in some names
(You're relatively new here BTW so welcome!)  It sounds as though your import sheet did not specify a country, but your site allows for multiple countries and thus multiple states/provinces.  Even if the United States is your default country, I've found that the import routine will pick the first country it finds in the list of countries with similar state abbreviations, rather than hitting the correct one.  The workaround to this is pretty simple; include a column for country in your import and populate it with United States (or the appropriate country).

Hope this helps!