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Nexis Uni allows searching across multiple sources from within a country. Run your search, then use filtering options on the left to limit by "Location of Publication." (Begin with International, then choose a region of the world, then choose a country if desired).
Excellent for major news sources in the U.S.; also includes some international sources. To find international sources, go underneath the search box to: Source / Select Source Category: By Region, and then drill down to the level of filtering you desire (by region, or by country).