"What was the official date of the formation of the ""United Kingdom of Great Britain and Ireland""?"
History of the United Kingdom to the countries of continental Europe that his armies had overrun. On 1 January 1801, the first day of the 19th century, the Great Britain and Ireland joined to form the United Kingdom of Great Britain and Ireland. The legislative union of Great Britain and Ireland was brought about by the Act of Union 1800, creating the "United Kingdom of Great Britain and Ireland". The Act was passed in both the Parliament of Great Britain and the Parliament of Ireland, dominated by the Protestant Ascendancy and lacking representation of the country's Roman Catholic population. Substantial majorities were achieved, and according
United Kingdom of Great Britain and Ireland United Kingdom of Great Britain and Ireland The United Kingdom of Great Britain and Ireland was established by the Acts of Union 1800, which merged the kingdoms of Great Britain and Ireland. The United Kingdom having financed the European coalition that defeated France during the Napoleonic Wars, developed a large Royal Navy that led the British Empire to become the foremost world power for the next century. The Crimean War with Russia and the Boer wars were relatively small operations in a largely peaceful century. Rapid industrialisation that began in the decades prior to the state's formation continued up until