The Roman invasion of Britain in 55 BC and most of Britain's subsequent incorporation into the Roman Empire stimulated development and brought more active contacts with the rest of Europe. As Rome's strength declined, the country again was exposed to invasion--including the pivotal incursions of the Angles, Saxons, and Jutes in the fifth and sixth centuries AD--up to the Norman conquest in 1066. Norman rule effectively ensured Britain's safety from further intrusions; certain institutions, which remain characteristic of Britain, could develop. Among these are a political, administrative, cultural, and economic center in London; a separate but established church; a system of common law; distinctive and distinguished university education; and representative government.
The military history of the United Kingdom covers the period from the creation of the united Kingdom of Great Britain in 1707, with the political union of England and Scotland, to the present day.From the 18th century, with the expansion of the British Empire and the country's industrial strength, Britain's military force became one of the largest and most powerful in the world, particularly its navy, with advanced technology and bases across the world. It declined during the 20th century in the wake of two world wars, decolonisation and the rise of the United States and the USSR as the new superpowers. Britain has been involved in a great many armed conflicts since the union in 1707, the majority alongside allies, on all continents except for Antarctica. Today it still remains a major power with frequent military interventions across the globe since the end of the Cold War in 1990.
