Which parallel defines the major border between the US and Canada? 👤 By The Quiz Wire ✅ Fact Checked 📊 Difficulty Medium 📅 Last Updated 01 Dec 2025 A. 38th Parallel B. 49th Parallel C. Tropic of Cancer D. Arctic Circle Check Answer 💡 Explanation: The 49th Parallel North forms the longest straight-line border between the USA and Canada. 📚 Topics: Borders and Boundaries Geography 🎯 Exams: CSS GEN PMS US_COMP
