The correct pairings are:
\begin{itemize}
\item A. New World Order: 1991 (after the end of the Cold War, George H. W. Bush referred to the emergence of a new geopolitical landscape).
\item B. World Trade Center: September 11, 2001 (the tragic terrorist attacks in the U.S.).
\item C. Operation Iraqi Freedom: Iraq (the U.S.-led invasion in 2003).
\item D. Operation Enduring Freedom: Afghanistan (the U.S. military operation in Afghanistan post-9/11).
\end{itemize}
Historical Context: These events reflect significant moments in the global political landscape, particularly the post-Cold War era and the War on Terror.