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
The United States has been militarily involved in "Southwest Asia" in the 1990s and into the early decades of the new millennium, since this constitutes the Middle East, where the US has launched a war on terror.
