The MBA in International Business only focuses on India, China, and sub-Saharan Africa. Is there a reason for the restriction?

Because these are the countries with the largest and fastest-growing industries in business today. Acquiring skills to analyze business opportunities and develop strategies tailored to these markets can give you a competitive edge.

Additionally, there's already ample information for other major markets - US, UK, and CA but very little information on these 3 markets.