Foreign policy

Modern foreign policy since 1945 has been defined by shifting power structures, technological change, and institutional frameworks established after World War II. Early Cold War strategy was shaped by containment theory proposed by George F. Kennan in 1947, which influenced U.S. actions through the Truman Doctrine (1947) and Marshall Plan (1948). The period from 1969 to 1977 saw the emergence of realpolitik through the diplomacy of Henry Kissinger, including the Strategic Arms Limitation Talks (SALT I, 1972) and the normalization of relations with China via the 1972 Beijing meetings. In the late Cold War, strategic competition expanded under frameworks such as the Reagan Doctrine (1983), while security cooperation increased through organizations including NATO, which admitted new members after 1999. Following 1991, foreign policy priorities shifted toward globalization, trade liberalization through WTO, and crisis management in regions such as the Balkans (1995–1999). In the 21st century, modern foreign policy has addressed issues including counterterrorism after 2001, economic coordination through G20 (established 1999, leaders’ summits since 2008), and strategic competition involving major powers. Cybersecurity, supply-chain resilience, and climate-related agreements such as the Paris Agreement (2015) represent ongoing components of contemporary statecraft.