Question: When did the Acts of Union 1800, which was represented in Parliament by such unions as New Ross, take effect?

Context paragraphs:
New Ross, Nova Scotia: New Ross is a community in the Canadian province of Nova Scotia, located in the Chester Municipal District.  Home of the Ross Farm Museum.  The village is named after Henry Phipps, 1st Earl of Mulgrave, whose second title derives its name from New Ross, Ireland.

Trinidad and Tobago Independence Act 1962: The Trinidad and Tobago Independence Act 1962 (c. 54) was an Act of the Parliament of the United Kingdom that granted independence to Trinidad and Tobago with effect from 31 August 1962.  The Act also provided for the granting of a new Constitution of Trinidad and Tobago to take effect upon independence.

Diocese of Cork: The Diocese of Cork was established in the seventh century.  The diocese of Cork was one of the twenty-four dioceses established at the Synod of Rathbreasail on an ancient bishopric founded by Saint Finbarr in the sixth-century.  On 30 July 1326, Pope John XXII, on the petition of King Edward II of England, issued a papal bull for the union of the bishoprics of Cork and Cloyne, the union to take effect on the death of either bishop.  The union should have taken effect on the death of Philip of Slane in 1327, however, bishops were still appointed to each separate bishopric.  The union eventually took place with Jordan Purcell appointed bishop of the united see of Cork and Cloyne in 1429.

Barbados Independence Act 1966: The Barbados Independence Act 1966 (c. 37) is an Act of the Parliament of the United Kingdom that granted independence to Barbados with effect from 30 November 1966.  The Act also provided for the granting of a new constitution to take effect upon independence, which was done by the Barbados Independence Order 1966.

Monarchy of Ireland: 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.

New Ross (UK Parliament constituency): New Ross was a United Kingdom Parliament constituency, in Ireland, returning one Member of Parliament (MP).  It was an original constituency represented in Parliament when the Union of Great Britain and Ireland took effect on 1 January 1801.

2012 Middle Tennessee Blue Raiders football team: The 2012 Middle Tennessee Blue Raiders football team represented Middle Tennessee State University in the 2012 NCAA Division I FBS football season.  They were led by seventh-year head coach Rick Stockstill and played their home games at Johnny "Red" Floyd Stadium.  The 2012 season proved to be the last for the Blue Raiders in the Sun Belt Conference; Middle Tennessee had initially announced a move to Conference USA (C-USA) to take effect no later than July 2014, and later announced that the move to C-USA would take effect in July 2013.  They finished the season 8–4, 6–2 in Sun Belt play to finish in a three way tie for second place.  Despite finishing in second place and being two games above bowl eligibility, the Blue Raiders were not invited to a bowl game.

Parliament of Great Britain: 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.

Acts of Union 1800: 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.

Irish House of Lords: The Irish House of Lords was the upper house of the Parliament of Ireland that existed from medieval times until 1800.  It was modelled on the House of Lords of England, with members of the Peerage of Ireland sitting in the Irish Lords, just as members of the Peerage of England did at Westminster.  When the Act of Union 1800 abolished the Irish parliament, a subset of Irish peers sat in the House of Lords of the merged Parliament of the United Kingdom.

Supporting paragraphs: New Ross (UK Parliament constituency) Acts of Union 1800
Answer: 1 January 1801