I believe it is a lot more beneficial to major in International Studies with a regional focus, particularly one that interests you. Your interest will take you a long way to ensuring you stay motivated in competing your coursework, degree requirements, and further studies down the road. It never hurts to become specialized in an area of the world that interests you, but also combine that with language study. This will give you the added benefit of becoming specialized in an area, their issues, government, culture, people, and even language. That, combined with your general International Studies coursework, would give you a wonderful foundation to complete your undergraduate degree and continue on to further studies if you wish, or pursue your career in whatever area you desire (e.g., development, law, policy, research/teaching, etc.).
When I was an undergraduate, I majored in International Studies as well, and focused on Latin America. Why? Well, my family is from Peru, I speak Spanish, love the region, and wanted to maintain knowledge about it. I also loved traveling, and wanted to be aware of what was going on. Ultimately, use your own background, experiences, and interests to determine which region you find yourself drawn to, and maybe where you would want to travel to or work in one day.