Apollo 8 launches as the space race intensifies

The Czechoslovak Communist Party chose Dubček as First Secretary and began reforms that widened debate and promised a more participatory form of socialism. The movement reflected Czechoslovak demands;...

The Soviet Union signed the NPT with the United States and United Kingdom. The treaty aimed to prevent the spread of nuclear weapons, but it institutionalized unequal categories between nuclear-weapon...

Soviet and allied forces entered Czechoslovakia to end the Prague Spring reforms. Romania did not take part. The intervention affirmed Moscow’s claim to limit the sovereignty of socialist states and...

After detention and transport to Moscow, Czechoslovak leaders signed a protocol that reversed key reform measures and accepted a continued Soviet military presence. The agreement was made under...

A Pravda article by Sergei Kovalev argued that the sovereignty of a socialist country could not override the interests of the wider socialist community. It supplied a public rationale for intervention...

Chinese and Soviet troops clashed on the disputed island known in China as Zhenbao and in the USSR as Damansky. The confrontation reflected unresolved border claims and a widening political split;...

The automated probe launched during the Apollo 11 mission, aiming to collect lunar soil and return it to Earth. It crashed on the Moon, but the mission reveals how Baikonur and Kazakh territory...

The USSR and United States opened Strategic Arms Limitation Talks on offensive weapons and missile defenses. Détente reduced some risks of direct confrontation but prioritized superpower security...

The NPT entered into force after the required ratifications, including the Soviet Union’s. It established a framework for nonproliferation and disarmament but left nuclear arsenals in the hands of the...

The two governments renounced force and accepted the postwar European borders as a basis for détente. The treaty reduced confrontation between states while leaving unresolved the experiences of people...