Cold War: At the Brandenburg Gate, U.S. President Ronald Reagan publicly challenges Mikhail Gorbachev to tear down the Berlin Wall.

The Cold War was a period of global geopolitical rivalry between the United States (US) and the Soviet Union (USSR) and their respective allies, the capitalist Western Bloc and communist Eastern Bloc, which began in the aftermath of the Second World War and ended with the dissolution of the Soviet Union in 1991. The term cold war is used because there was no direct fighting between the two superpowers, though each supported opposing sides in regional conflicts known as proxy wars. In addition to the struggle for ideological and economic influence and an arms race in both conventional and nuclear weapons, the Cold War was expressed through technological rivalries such as the Space Race, espionage, propaganda campaigns, embargoes, and sports diplomacy.

The Brandenburg Gate is an 18th-century neoclassical monument in Berlin. One of the best-known landmarks of Germany, it was erected on the site of a former city gate that marked the start of the road from Berlin to Brandenburg an der Havel, the former capital of the Margraviate of Brandenburg. The current structure was built from 1788 to 1791 by orders of King Frederick William II of Prussia, based on designs by the royal architect Carl Gotthard Langhans. The bronze sculpture of the quadriga crowning the gate is a work by the sculptor Johann Gottfried Schadow.

The president of the United States (POTUS) is the head of state and head of government of the United States. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces.

Ronald Wilson Reagan was an American politician and actor who served as the 40th president of the United States from 1981 to 1989. A member of the Republican Party, he became an important figure in the American conservative movement. The period encompassing his presidency is known as the Reagan era.