Dolly the sheep, the first mammal cloned from an adult somatic cell, is born at the Roslin Institute in Scotland.
After capturing Srebrenica, Bosnian Serb forces kill more than 8,000 Bosniak men and boys; international courts have ruled it a genocide.
A peace agreement negotiated in Dayton, United States, is formally signed in Paris, ending the Bosnian War.
Britain transfers sovereignty over Hong Kong to China under the 'one country, two systems' principle.
The British and Irish governments and Northern Ireland's parties sign a peace agreement, ending most of the violence of the Troubles.
The Maastricht Treaty enters into force, formally establishing the European Union and laying the groundwork for a single currency.
Bosnian Serb forces besiege Sarajevo, capital of Bosnia and Herzegovina, for nearly four years, the longest siege of a capital city in modern warfare.