Question: What had abolished slavery throughout the empire that did not fall after World War I?

full_context: Document 1: British Empire: With support from the British abolitionist movement, Parliament enacted the Slave Trade Act in 1807, which abolished the slave trade in the empire. In 1808, Sierra Leone was designated an official British colony for freed slaves. The Slavery Abolition Act passed in 1833 abolished slavery in the British Empire on 1 August 1834 (with the exception of St. Helena, Ceylon and the territories administered by the East India Company, though these exclusions were later repealed). Under the Act, slaves were granted full emancipation after a period of 4 to 6 years of "apprenticeship".
Document 2: United Kingdom of Great Britain and Ireland: 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 ''.
Document 3: History of Ireland: In 1922, after the Irish War of Independence and the Anglo - Irish Treaty, most of Ireland seceded from the United Kingdom to become the independent Irish Free State, which after the 1937 constitution, began to call itself Ireland. The six northeastern counties, known as Northern Ireland, remained within the United Kingdom. The Irish Civil War followed soon after the War of Independence. The history of Northern Ireland has since been dominated by sporadic sectarian conflict between (mainly Catholic) Irish nationalists and (mainly Protestant) unionists. This conflict erupted into the Troubles in the late 1960s, until peace was achieved with the Belfast Agreement thirty years later.
Document 4: New York City: Under New York State's gradual abolition act of 1799, children of slave mothers were born to be eventually liberated but were held in indentured servitude until their mid-to-late twenties. Together with slaves freed by their masters after the Revolutionary War and escaped slaves, a significant free-black population gradually developed in Manhattan. Under such influential United States founders as Alexander Hamilton and John Jay, the New York Manumission Society worked for abolition and established the African Free School to educate black children. It was not until 1827 that slavery was completely abolished in the state, and free blacks struggled afterward with discrimination. New York interracial abolitionist activism continued; among its leaders were graduates of the African Free School. The city's black population reached more than 16,000 in 1840.
Document 5: Slave Trade Act 1807: The Slave Trade Act 1807, officially An Act for the Abolition of the Slave Trade, was an Act of the Parliament of the United Kingdom prohibiting the slave trade in the British Empire. Although it did not abolish the practice of slavery, it did encourage British action to press other nations states to abolish their own slave trades.
Document 6: British Empire: In 1919, the frustrations caused by delays to Irish home rule led members of Sinn Féin, a pro-independence party that had won a majority of the Irish seats at Westminster in the 1918 British general election, to establish an Irish assembly in Dublin, at which Irish independence was declared. The Irish Republican Army simultaneously began a guerrilla war against the British administration. The Anglo-Irish War ended in 1921 with a stalemate and the signing of the Anglo-Irish Treaty, creating the Irish Free State, a Dominion within the British Empire, with effective internal independence but still constitutionally linked with the British Crown. Northern Ireland, consisting of six of the 32 Irish counties which had been established as a devolved region under the 1920 Government of Ireland Act, immediately exercised its option under the treaty to retain its existing status within the United Kingdom.
Document 7: Baptists: Elsewhere in the Americas, in the Caribbean in particular, Baptist missionaries took an active role in the anti-slavery movement. In Jamaica, for example, William Knibb, a prominent British Baptist missionary, worked toward the emancipation of slaves in the British West Indies (which took place in 1838). Knibb also protagonised the creation of "Free Villages"; rural communities centred around a Baptist church where emancipated slaves could farm their own land. Baptists were likewise active in promoting the education of former slaves; for example, Jamaica's Calabar High School, named after the slave port of Calabar, was formed by Baptist missionaries. At the same time, during and after slavery, slaves and free formed their own Spiritual Baptist movements - breakaway spiritual movements which often expressed resistance to oppression.
Document 8: Aftermath of World War I: Ireland: Irish Free State (approximately five - sixths of the island) gained independence from the United Kingdom (but still part of the British Empire)
Document 9: History of the Republic of Ireland: The Irish state came into being in 1922 as the Irish Free State, a dominion of the British Commonwealth, having seceded from the United Kingdom under the Anglo - Irish Treaty. It comprises 26 of the island of Ireland's 32 counties. The 1937 constitution renamed the state Ireland. In 1949 it explicitly became a republic, definitively ending its tenuous membership of the British Commonwealth. In 1973 it joined the European Communities.
Document 10: Republic of Ireland: In accordance with the treaty, on 6 December 1922 the entire island of Ireland became a self - governing dominion called the Irish Free State (Saorstát Éireann). Under the Constitution of the Irish Free State, the Parliament of Northern Ireland had the option to leave the Irish Free State one month later and return to the United Kingdom. During the intervening period, the powers of the Parliament of the Irish Free State and Executive Council of the Irish Free State did not extend to Northern Ireland. Northern Ireland exercised its right under the treaty to leave the new dominion and rejoined the United Kingdom on 8 December 1922. It did so by making an address to the King requesting, ``that the powers of the Parliament and Government of the Irish Free State shall no longer extend to Northern Ireland. ''The Irish Free State was a constitutional monarchy sharing a monarch with the United Kingdom and other dominions of the British Commonwealth. The country had a governor - general (representing the monarch), a bicameral parliament, a cabinet called the`` Executive Council'', and a prime minister called the President of the Executive Council.
Document 11: Protestantism: Also, other human rights were advocated for by some Protestants. For example, torture was abolished in Prussia in 1740, slavery in Britain in 1834 and in the United States in 1865 (William Wilberforce, Harriet Beecher Stowe, Abraham Lincoln - against Southern Protestants). Hugo Grotius and Samuel Pufendorf were among the first thinkers who made significant contributions to international law. The Geneva Convention, an important part of humanitarian international law, was largely the work of Henry Dunant, a reformed pietist. He also founded the Red Cross.
Document 12: History of Ireland: Unwilling to negotiate any understanding with Britain short of complete independence, the Irish Republican Army, the army of the newly declared Irish Republic, waged a guerilla war (the Irish War of Independence) from 1919 to 1921. In the course of the fighting and amid much acrimony, the Fourth Government of Ireland Act 1920 implemented Home Rule while separating the island into what the British government's Act termed ``Northern Ireland ''and`` Southern Ireland''. In July 1921 the Irish and British governments agreed to a truce that halted the war. In December 1921 representatives of both governments signed an Anglo - Irish Treaty. The Irish delegation was led by Arthur Griffith and Michael Collins. This abolished the Irish Republic and created the Irish Free State, a self - governing Dominion of the Commonwealth of Nations in the manner of Canada and Australia. Under the Treaty, Northern Ireland could opt out of the Free State and stay within the United Kingdom: it promptly did so. In 1922 both parliaments ratified the Treaty, formalising independence for the 26 - county Irish Free State (which renamed itself Ireland in 1937, and declared itself a republic in 1949); while the 6 - county Northern Ireland, gaining Home Rule for itself, remained part of the United Kingdom. For most of the next 75 years, each territory was strongly aligned to either Catholic or Protestant ideologies, although this was more marked in the six counties of Northern Ireland.
Document 13: British Empire: Two years later, the Royal African Company was inaugurated, receiving from King Charles a monopoly of the trade to supply slaves to the British colonies of the Caribbean. From the outset, slavery was the basis of the British Empire in the West Indies. Until the abolition of the slave trade in 1807, Britain was responsible for the transportation of 3.5 million African slaves to the Americas, a third of all slaves transported across the Atlantic. To facilitate this trade, forts were established on the coast of West Africa, such as James Island, Accra and Bunce Island. In the British Caribbean, the percentage of the population of African descent rose from 25 percent in 1650 to around 80 percent in 1780, and in the 13 Colonies from 10 percent to 40 percent over the same period (the majority in the southern colonies). For the slave traders, the trade was extremely profitable, and became a major economic mainstay for such western British cities as Bristol and Liverpool, which formed the third corner of the so-called triangular trade with Africa and the Americas. For the transported, harsh and unhygienic conditions on the slaving ships and poor diets meant that the average mortality rate during the Middle Passage was one in seven.
Document 14: Saint Helena: Although the importation of slaves to St Helena had been banned in 1792, the phased emancipation of over 800 resident slaves did not take place until 1827, which was still some six years before the British Parliament passed legislation to ban slavery in the colonies.
Document 15: Slavery in international law: The concept has its roots in the 1807 Abolition of Slavery Act of Great Britain. Many academics in the field perceive this as the beginning of the end of the traditional form of slavery: chattel slavery. In the 19th century, Britain controlled the majority of the world through its colonies. Consequently, in passing this law to abolish slavery, the British Parliament abolished slavery in the vast majority of its colonies.
ground_truth: The Slavery Abolition Act
sub_queries: this empire did not fall after world war i Answer: the British Empire
What abolished slavery throughout the British Empire ? Answer: The Slavery Abolition Act