Question: The Border Regiment was a line infantry regiment of the British Army, which was formed in 1881 under the Childers Reforms by the amalgamation of the 34th (Cumberland) Regiment of Foot and the 55th (Westmorland) Regiment of Foot, the 55th Regiment of Foot was a British Army infantry regiment, raised in which year?

Context paragraphs:
98th (Prince of Wales's) Regiment of Foot: The 98th (Prince of Wales) Regiment of Foot was an infantry regiment of the British Army.  It was originally raised in 1824 as the 98th Regiment of Foot, before assuming the title of the 98th (Prince of Wales) Regiment of Foot in 1876.  Later, in 1881, following the Childers Reforms of the British Army, the regiment was amalgamated with the 64th Regiment of Foot to become the Prince of Wales's (North Staffordshire) Regiment.  As the 64th Foot was senior to the 98th, the 98th became the 2nd Battalion in the new regiment.  Throughout the course of the regiment's existence it served mostly overseas in South Africa, China and India.

34th (Cumberland) Regiment of Foot: The 34th Regiment of Foot was an infantry regiment of the British Army, raised in 1702.  Under the Childers Reforms it amalgamated with the 55th (Westmorland) Regiment of Foot to form the Border Regiment in 1881.

Worcestershire Regiment: The Worcestershire Regiment was a line infantry regiment in the British Army, formed in 1881 under the Childers Reforms by the amalgamation of the 29th (Worcestershire) Regiment of Foot and the 36th (Herefordshire) Regiment of Foot.  The regiment fought in many conflicts, including both the First and Second World Wars, until 1970, when it was amalgamated with the Sherwood Foresters (Nottinghamshire and Derbyshire Regiment) to form the Worcestershire and Sherwood Foresters Regiment (29th/44th Foot).  In September 2007, the regiment amalgamated with the Cheshire Regiment and the Staffordshire Regiment (Prince of Wales's) to form the Mercian Regiment.

55th (Westmorland) Regiment of Foot: The 55th Regiment of Foot was a British Army infantry regiment, raised in 1755.  After 1782 it had a county designation added, becoming known as the 55th (Westmorland) Regiment of Foot.  Under the Childers Reforms it amalgamated with the 34th (Cumberland) Regiment of Foot to form the Border Regiment in 1881.

Manchester Regiment: The Manchester Regiment was a line infantry regiment of the British Army in existence from 1881 until 1958.  The regiment was created during the 1881 Childers Reforms by the amalgamation of the 63rd (West Suffolk) Regiment of Foot and the 96th Regiment of Foot as the 1st and 2nd battalions; the Militia became the 3rd (Reserve) and 4th (Extra Reserve) battalions and the Volunteer battalions became the 5th, 6th, 7th, 8th, 9th and 10th battalions.

Border Regiment: The Border Regiment was a line infantry regiment of the British Army, which was formed in 1881 under the Childers Reforms by the amalgamation of the 34th (Cumberland) Regiment of Foot and the 55th (Westmorland) Regiment of Foot.

York and Lancaster Regiment: The York and Lancaster Regiment was a line infantry regiment of the British Army that existed from 1881 until 1968.  The regiment was created in the Childers Reforms of 1881 by the amalgamation of the 65th (2nd Yorkshire, North Riding) Regiment of Foot and the 84th (York and Lancaster) Regiment of Foot.  The regiment saw service in many small conflicts and both World War I and World War II until 1968 when the regiment chose to be disbanded rather than amalgamated with another regiment, one of only two infantry regiments in the British Army to do so, with the other being the Cameronians (Scottish Rifles).

Royal Sussex Regiment: The Royal Sussex Regiment was a line infantry regiment of the British Army that was in existence from 1881 to 1966.  The regiment was formed in 1881 as part of the Childers Reforms by the amalgamation of the 35th (Royal Sussex) Regiment of Foot and the 107th Regiment of Foot (Bengal Light Infantry).  The regiment saw service in the Second Boer War, and both World War I and World War II.

North Staffordshire Regiment: The North Staffordshire Regiment (Prince of Wales's) was a line infantry regiment of the British Army, which was in existence between 1881 and 1959.  The 64th (2nd Staffordshire) Regiment of Foot was created on 21 April 1758 from the 2nd Battalion of the 11th Regiment of Foot.  In 1881, under the Childers Reforms, the 64th Regiment of Foot was merged with the 98th (Prince of Wales's) Regiment of Foot (originally raised in 1824) to form the Prince of Wales's (North Staffordshire Regiment).  In 1921 the regimental title was altered to the North Staffordshire Regiment (Prince of Wales's).

East Lancashire Regiment: The East Lancashire Regiment was, from 1881 to 1958, a line infantry regiment of the British Army.  The regiment was formed in 1881 under the Childers Reforms by the amalgamation of the 30th (Cambridgeshire) Regiment of Foot and 59th (2nd Nottinghamshire) Regiment of Foot with the militia and rifle volunteer units of eastern Lancashire.  In 1958 the regiment was amalgamated with the South Lancashire Regiment to form the Lancashire Regiment which was, in 1970, merged with the Loyal Regiment (North Lancashire) to form the Queen's Lancashire Regiment.  However, in 2006, the Queen's Lancashire were amalgamated with the King's Own Royal Border Regiment and the King's Regiment (Liverpool and Manchester) to form the present Duke of Lancaster's Regiment (King's, Lancashire and Border).

Supporting paragraphs: Border Regiment 55th (Westmorland) Regiment of Foot
Answer: 1755