Question: The Plum pudding model was first proposed by physicist from which country?

Context articles: J. J. Thomson
2-inch Medium Mortar
Plum pudding model
Kennedy Island
Rutherford model
Thomson problem
Biuku Gasa and Eroni Kumana
George Nicholas
Christmas pudding
Oxford Sandy and Black

Sir Joseph John Thomson {'1': ", '2': ", '3': ", '4': "} ( ; 18 December 1856 – 30 August 1940) was an English physicist and Nobel laureate in physics, credited with the discovery and identification of the electron; and with the discovery of the first subatomic particle.
The 2 inch Medium Trench Mortar, also known as the 2-inch Howitzer, and nicknamed the "Toffee Apple" or "Plum Pudding" mortar, was a British smooth bore muzzle loading (SBML) medium trench mortar in use in World War I from mid-1915 to mid-1917.
 The designation "2 inch" refers to the mortar barrel, into which only the 22-inch bomb shaft but not the bomb itself was inserted; the spherical bomb itself was actually 9 inches (230 mm) in diameter and weighed 42 lb (19 kg), hence this weapon is more comparable to a standard mortar of approximately 5-6 inch bore.
 The weapon is thought to be the origin of the phrase 'how do you like them apples?
'.
The plum pudding model is one of several scientific models of the atom.
 First proposed by J. J. Thomson in 1904 soon after the discovery of the electron, but before the discovery of the atomic nucleus, the model represented an attempt to consolidate the known properties of atoms at the time: 1) electrons are negatively-charged particles and 2) atoms are neutrally-charged.
Kennedy Island (colloquially known as Plum Pudding Island, though the local name is Kasolo Island) is a small uninhabited island in the Solomon Islands that was named after John F. Kennedy, following an incident involving Kennedy during his World War II naval career.
 Kennedy Island lies 15 minutes by boat from Gizo, the provincial capital of the Solomon Islands' Western Province.
The Rutherford model is a model of the atom devised by Ernest Rutherford.
 Rutherford directed the famous Geiger–Marsden experiment in 1909 which suggested, upon Rutherford's 1911 analysis, that J. J. Thomson's plum pudding model of the atom was incorrect.
 Rutherford's new model for the atom, based on the experimental results, contained the new features of a relatively high central charge concentrated into a very small volume in comparison to the rest of the atom and with this central volume also containing the bulk of the atomic mass of the atom.
 This region would be known as the "nucleus" of the atom.
The objective of the Thomson problem is to determine the minimum electrostatic potential energy configuration of "N" electrons constrained to the surface of a unit sphere that repel each other with a force given by Coulomb's law.
 The physicist J. J. Thomson posed the problem in 1904 after proposing an atomic model, later called the plum pudding model, based on his knowledge of the existence of negatively charged electrons within neutrally-charged atoms.
Biuku Gasa (27 July 1923 – 23 November 2005) and Eroni Kumana (?
 – 2 August 2014) were Solomon Islanders of Melanesian descent, who found John F. Kennedy and his surviving "PT-109" crew following the boat's collision with the Japanese destroyer "Amagiri" near Plum Pudding Island on 1 August 1943.
 They were from the Western Province of the Solomon Islands.
George Nicholas (c. 1754 – July 25, 1799) was the first professor of law at Transylvania University in Kentucky.
 He was also briefly attorney general of Kentucky, and had been several times a member of the Virginia House of Delegates.
 He was the son of Robert C. Nicholas, Sr.; his brothers included Wilson Cary Nicholas.
 He was the father of Robert C. Nicholas.
 He was a friend and correspondent of James Madison; he was also extremely fat, and Madison laughed until he cried at a caricature of Nicholas, during the Virginia convention to ratify the United States Constitution, as a plum pudding with legs.
Christmas pudding is a type of pudding traditionally served as part of the Christmas dinner in the UK, Ireland and in other countries where it has been brought by British emigrants.
 It has its origins in medieval England, and is sometimes known as plum pudding or just "pud", though this can also refer to other kinds of boiled pudding involving dried fruit.
 Despite the name "plum pudding," the pudding contains no actual plums due to the pre-Victorian use of the word "plums" as a term for raisins.
 The pudding is composed of many dried fruits held together by egg and suet, sometimes moistened by treacle or molasses and flavoured with cinnamon, nutmeg, cloves, ginger, and other spices.
 The pudding is usually aged for a month or more, or even a year; the high alcohol content of the pudding prevents it from spoiling during this time.
The Oxford Sandy and Black is a breed of domestic pig originating in Oxfordshire.
 Named for its colour, which is a base of sandy brown with black patches, the breed is also sometimes called the "Plum Pudding" or "Oxford Forest pig."
 Related to the old Berkshire and Tamworth breeds, it is one of the oldest pigs native to Britain.