Question: Which country was united with Kingdom of Great Britain and made The Acts of Union 1800?

Context articles: Secretary of State (Ireland)
History of Ireland (1691–1801)
Tory government, 1783–1801
United Kingdom of Great Britain and Ireland
Parliament of Great Britain
Acts of Union 1800
Augher (Parliament of Ireland constituency)
Monarchy of Ireland
Pornography in the United Kingdom
Peerage of Great Britain

The Principal Secretary of State, or Principal Secretary of the Council, was a government office in the Kingdom of Ireland.
 It was abolished in 1801 when Ireland became part of the United Kingdom of Great Britain and Ireland under the Acts of Union 1800.
The history of Ireland from 1691–1801 was marked by the dominance of the Protestant Ascendancy.
 These were Anglo-Irish families of the Anglican Church of Ireland, whose English ancestors had settled Ireland in the wake of its conquest by England and colonisation in the Plantations of Ireland, and now owned most of the land.
 Many were absentee landlords based in England, but others lived full-time in Ireland and increasingly identified as Irish.
 (See Early Modern Ireland 1536-1691).
 During this time, Ireland was a theoretically autonomous Kingdom with its own Parliament; in reality it was a client state controlled by the King of Great Britain and supervised by his cabinet in London.
 The great majority of its population, Roman Catholics, were excluded from power and land ownership under the penal laws.
 The second-largest group, the Presbyterians in Ulster, owned land and businesses but could not vote and had no political power.
 The period begins with the defeat of the Catholic Jacobites in the Williamite War in Ireland in 1691 and ends with the Acts of Union 1800, which formally annexed Ireland in a United Kingdom from 1 January 1801 and dissolved the Irish Parliament.
Tory William Pitt the Younger led the government of the Kingdom of Great Britain from 1783 to 1801.
 In 1800, the Acts of Union between Great Britain and Ireland were accepted by their respective parliaments, creating the new United Kingdom of Great Britain and Ireland, which would be governed by the former Parliament of Great Britain, now the Parliament of the United Kingdom.
 Pitt governed this new state for the first month of its existence, until differences with King George III over Catholic Emancipation caused him to resign.
The United Kingdom of Great Britain and Ireland was established as a sovereign state on 1 January 1801 by the Acts of Union 1800, which merged the kingdoms of Great Britain and Ireland.
 The growing desire for an Irish Republic led to the Irish War of Independence, which resulted in Ireland seceding from the Union and forming the Irish Free State in 1922.
 Northern Ireland remained part of the United Kingdom, and the state was consequently renamed the "United Kingdom of Great Britain and Northern Ireland".
The Parliament of Great Britain was formed in 1707 following the ratification of the Acts of Union by both the Parliament of England and the Parliament of Scotland.
 The Acts created a new unified Kingdom of Great Britain and dissolved the separate English and Scottish parliaments in favour of a single parliament, located in the former home of the English parliament in the Palace of Westminster, near the City of London.
 This lasted nearly a century, until the Acts of Union 1800 merged the separate British and Irish Parliaments into a single Parliament of the United Kingdom with effect from 1 January 1801.
The Acts of Union 1800 (sometimes erroneously referred to as a single Act of Union 1801) united the Kingdom of Great Britain and the Kingdom of Ireland (previously in personal union) to create the United Kingdom of Great Britain and Ireland with effect from 1 January 1801.
 The "Irish" Act (the Act of the (Old) Irish Parliament) however has since been repealed in the Republic of Ireland some time after Independence.
Augher was a constituency represented in the Irish House of Commons until the Acts of Union 1800 came into force on January 1, 1801.
A monarchical system of government existed in Ireland from ancient times until, for what became the Republic of Ireland, the mid-twentieth century.
 Northern Ireland, as part of the United Kingdom, remains under a monarchical system of government.
 The Gaelic kingdoms of Ireland ended with the Norman invasion of Ireland, when the kingdom became a fief of the Holy See under the Lordship of the King of England.
 This lasted until the Parliament of Ireland conferred the crown of Ireland upon King Henry VIII of England during the English Reformation.
 The monarch of England held the crowns of England and Ireland in a personal union.
 The Union of the Crowns in 1603 expanded the personal union to include Scotland.
 The personal union between England and Scotland became a political union with the enactments of the Acts of Union 1707, which created the Kingdom of Great Britain.
 The crowns of Great Britain and Ireland remained in personal union until it was ended by the Acts of Union 1800, which united Ireland and Great Britain into the United Kingdom of Great Britain and Ireland from January 1801 until December 1922.
Pornography in the United Kingdom has existed since the United Kingdom was formed by the Acts of Union 1800.
 Before that it was found in Great Britain which was formed by the Acts of Union 1707, and earlier still in the four countries of which the modern kingdom consists.
 The Victorian pornographic tradition included French photographs, erotic prints, and printed literature.
 As technology has advanced, pornography has taken diverse forms and become more widespread in society.
 In the twentieth century the production of pornographic magazines and films developed, and by the twenty-first century pornography was available by telephone, on television and via the internet.
 However, access to pornography has generally been more restricted than it has been in comparable Western countries.
The Peerage of Great Britain comprises all extant peerages created in the Kingdom of Great Britain after the Act of Union 1707 but before the Act of Union 1800.
 It replaced the Peerages of England and Scotland, until it was itself replaced by the Peerage of the United Kingdom in 1801.