The breakup of the Soviet Union in 1991, a pivotal event of the 20th century, resulted from complex internal and external factors, including political strife under Gorbachev and economic turmoil. Its dissolution led to the emergence of independent states, the end of the Cold War, and significant geopolitical shifts, including the dominance of the U.S. as the sole superpower. The long-term consequences continue to shape international relations and global dynamics in the 21st century.