You can't alter the design of linked spreadsheets in Access, so you'd either need to alter the sheet design at the source to include a column such as CountryOfOrigin, or create a table that contains this field as well as the others you need. You could then populate this table with a query based on the linked sheet. Sheets usually make poor tables because of the way Excel relates data (in columns instead of rows) so I'm guessing the extra table idea would be the way to go. You probably should post a pic of your linked sheet, or copy/paste it here as a table.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.