United Kingdom of Great Britain and Ireland

The United Kingdom of Great Britain and Ireland was the formal name of the United Kingdom during the period when it included the territory now known as the Republic of Ireland.
The United Kingdom of Great Britain and Ireland came into being on 1 January 1801 under the terms of the Acts of Union 1800, by which the formerly separate kingdoms of Great Britain and Ireland were united. (The Kingdom of Great Britain had itself been formed in 1707 by the union of the formerly separate kingdoms of England and Scotland.)
By the 1921 Anglo-Irish Treaty the greater part of Ireland became independent on 6 December 1922 as the Irish Free State. In consequence, the formal name of the United Kingdom was changed in 1927 to the United Kingdom of Great Britain and Northern Ireland.The present-day United Kingdom is the same state as of the United Kingdom of Great Britain and Ireland, and not a successor state, the southern portion of Ireland having seceded from the rest of the United Kingdom.
==The Second British Empire==
Between 1815 and 1914, a period referred to as Britain's "imperial century" by some historians, around 10,000,000 square miles (26,000,000 km²) of territory and roughly 400 million people were added to the British Empire.
Victory over Napoleon left Britain without any serious international rival, other than Russia in central Asia. Unchallenged at sea, Britain adopted the role of global policeman, a state of affairs later known as the Pax Britannica, and a foreign policy of "splendid isolation".
Alongside the formal control it exerted over its own colonies, Britain's dominant position in world trade meant that it effectively controlled the economies of many countries, such as China, Argentina and Siam, which has been characterised by some historians as "informal empire".
British imperial strength was underpinned by the steamship and the telegraph, new technologies invented in the second half of the 19th century, allowing it to control and defend the empire. By 1902, the British Empire was linked together by a network of telegraph cables, the so-called All Red Line.
===Company Rule in India===
During its first century of operation, the English East India Company focused on trade with the Indian subcontinent, as it was not in a position to challenge the powerful Mughal Empire, which had granted it trading rights in 1617. This changed in the 18th century as the Mughals declined in power and the East India Company struggled with its French counterpart, the Compagnie française des Indes orientales, during the Carnatic Wars in the 1740s and 1750s. The Battle of Plassey in 1757, which saw the British, led by Robert Clive, defeat the Nawab of Bengal and his French allies, left the Company in control of Bengal and as the major military and political power in India.
In the following decades it gradually increased the size of the territories under its control, either ruling directly or via local rulers under the threat of force from the British Indian Army, the vast majority of which was composed of Indian sepoys.
British India eventually grew into the empire's most valuable possession, "the Jewel in the Crown"; covering a territory greater than that of the Roman Empire, it was the most important source of Britain's strength, defining its status as the world's greatest power.
===Exploration of the Pacific===
Since 1718, transportation to the American colonies had been a penalty for various criminal offences in Britain, with approximately one thousand convicts transported per year across the Atlantic.
Forced to find an alternative location after the loss of the 13 Colonies in 1783, the British government turned to the newly discovered lands of Australia.
The western coast of Australia had been discovered for Europeans by the Dutch explorer Willem Jansz in 1606 and was later named by the Dutch East India Company New Holland, but there was no attempt to colonise it. In 1770 James Cook discovered the eastern coast of Australia while on a scientific voyage to the South Pacific Ocean, claimed the continent for Britain, and named it New South Wales.
In 1778, Joseph Banks, Cook's botanist on the voyage, presented evidence to the government on the suitability of Botany Bay for the establishment of a penal settlement, and in 1787 the first shipment of convicts set sail, arriving in 1788.
Britain continued to transport convicts to New South Wales until 1840. The Australian colonies became profitable exporters of wool and gold, mainly due to gold rushes in the colony of Victoria, making its capital Melbourne the richest city in the world and the largest city after London in the British Empire.
During his voyage, Cook also visited New Zealand, first discovered by Dutch explorer Abel Tasman in 1642, and claimed the North and South islands for the British crown in 1769 and 1770 respectively. Initially, interaction between the indigenous Māori population and Europeans was limited to the trading of goods. European settlement increased through the early decades of the 19th century, with numerous trading stations established, especially in the North. In 1839, the New Zealand Company announced plans to buy large tracts of land and establish colonies in New Zealand. On 6 February 1840, Captain William Hobson and around 40 Maori chiefs signed the Treaty of Waitangi.
This treaty is considered by many to be New Zealand's founding document, but differing interpretations of the Maori and English versions of the text have meant that it continues to be a source of dispute.
===War with Napoleonic France===
==World War I==
Britain's fears of war with Germany were realised in 1914 with the outbreak of the First World War. The British declaration of war on Germany and its allies also committed the colonies and Dominions, which provided invaluable military, financial and material support. Over 2.5 million men served in the armies of the Dominions, as well as many thousands of volunteers from the Crown colonies.
Most of Germany's overseas colonies in Africa were quickly invaded and occupied, and in the Pacific, Australia and New Zealand occupied German New Guinea and Samoa respectively. The contributions of Australian, Newfoundland and New Zealand troops during the 1915 Gallipoli Campaign against the Ottoman Empire had a great impact on the national consciousness at home, and marked a watershed in the transition of Australia and New Zealand from colonies to nations in their own right. The countries continue to commemorate this occasion on ANZAC Day. Canadians viewed the Battle of Vimy Ridge in a similar light.
The important contribution of the Dominions to the war effort was recognised in 1917 by the British Prime Minister David Lloyd George when he invited each of the Dominion Prime Ministers to join an Imperial War Cabinet to coordinate imperial policy.
Under the terms of the concluding Treaty of Versailles signed in 1919, the empire reached its greatest extent with the addition of 1,800,000 square miles (4,700,000 km²) and 13 million new subjects.
The colonies of Germany and the Ottoman Empire were distributed to the Allied powers as League of Nations Mandates. Britain gained control of Palestine, Transjordan, Iraq, parts of Cameroon and Togo, and Tanganyika. The Dominions themselves also acquired mandates of their own: South-West Africa (modern-day Namibia) was given to the Union of South Africa, Australia gained German New Guinea, and New Zealand Western Samoa. Nauru was made a combined mandate of Britain and the two Pacific Dominions.
==Inter-War Period==
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==World War II==
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==Fall of the Second Empire==
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