The document discusses the shifting global power dynamics in the 21st century away from unipolarity dominated by the United States. While the US remains the only military superpower, its power has limitations as shown by the wars in Iraq and Afghanistan. China has emerged as an economic power and is translating that into growing military capabilities including an aircraft carrier. This expanded military reach has caused tensions as China claims territories in the South and East China Seas that overlap with others in the region. It remains uncertain whether China will integrate peacefully into the international system or become a rival to US power.