In which of the following regions has the United States been militarily involved, in the 1990s and into the early decades of the new millennium? A. China B. South Africa C. Southwest Asia D. Central America
It has been primarily "Southwest Asia," that the United States has been militarily involved in the 1990s and into the early decades of the new millennium, since this qualifies as the "Middle East," where the US continues to fight terrorism.
