Headline: US border walls are controversial-but are they effectiveLink: https://www.bbc.com/news/world-us-canada-67024002Publication Date: Friday, October 6, 2023Primary Source: BBC News (U.K.)Non-Cato Author: Bernd Debusmann JrType: articleFormat: Newspaper (Print)Nature of Mention: mentionedScholar: CatoResearch Area: Immigration and Labor MarketsSubjects: the US-Mexico border wall