Question: When did the country having apache helicopters in the kingdom in Europe recently having voted to leave a federal union end slavery?

<P0-S0> The Army Air Corps (AAC) is a component of the British Army, first formed in 1942 during the Second World War by grouping the various airborne units of the British Army (which are no longer part of the AAC). <P0-S1> Today, there are eight regiments (7 Regular Army and 1 Reserve) of the AAC as well as four Independent Flights and two Independent Squadrons deployed in support of British Army operations across the world. <P0-S2> They are located in Britain, Brunei, Canada, and Germany. <P0-S3> Some AAC squadrons provide the offensive and air assault elements of 16 Air Assault Brigade through Joint Helicopter Command. <SEP> <P1-S0> Also, other human rights were advocated for by some Protestants. <P1-S1> 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). <P1-S2> Hugo Grotius and Samuel Pufendorf were among the first thinkers who made significant contributions to international law. <P1-S3> The Geneva Convention, an important part of humanitarian international law, was largely the work of Henry Dunant, a reformed pietist. <P1-S4> He also founded the Red Cross. <SEP> <P2-S0> slavery in florida began under spanish rule and continued under american and later confederate rule. <P2-S1> it was theoretically abolished by president lincoln's emancipation proclamation of january 1, 1863, but this had little effect in florida. <P2-S2> slavery continued until the end of the civil war and collapse of the confederacy in the spring of 1865, followed by the ratification of the thirteenth amendment in december 1865. some of the characteristics of slavery -- inability to leave a disagreeable situation -- continued under sharecropping, convict leasing, vagrancy laws. <P2-S3> in the 20th and 21st centuries, conditions approximating slavery are found among marginal immigrant populations, especially migrant farm workers and involuntary sex workers. <SEP> <P3-S0> Until recently, in the absence of prior agreement on a clear and precise definition, the concept was thought to mean (as a shorthand) 'a division of sovereignty between two levels of government'. <P3-S1> New research, however, argues that this cannot be correct, as dividing sovereignty - when this concept is properly understood in its core meaning of the final and absolute source of political authority in a political community - is not possible. <P3-S2> The descent of the United States into Civil War in the mid-nineteenth century, over disputes about unallocated competences concerning slavery and ultimately the right of secession, showed this. <P3-S3> One or other level of government could be sovereign to decide such matters, but not both simultaneously. <P3-S4> Therefore, it is now suggested that federalism is more appropriately conceived as 'a division of the powers flowing from sovereignty between two levels of government'. <P3-S5> What differentiates the concept from other multi-level political forms is the characteristic of equality of standing between the two levels of government established. <P3-S6> This clarified definition opens the way to identifying two distinct federal forms, where before only one was known, based upon whether sovereignty resides in the whole (in one people) or in the parts (in many peoples): the federal state (or federation) and the federal union of states (or federal union), respectively. <P3-S7> Leading examples of the federal state include the United States, Germany, Canada, Switzerland, Australia and India. <P3-S8> The leading example of the federal union of states is the European Union. <SEP> <P4-S0> the commonwealth of virginia was a prominent part of the confederate states during the american civil war. <P4-S1> as a slave - holding state, it held a state convention to deal with the secession crisis, and voted against secession on 4 april 1861. opinion shifted after 15 april, when u.s. president abraham lincoln called for troops from all states still in the union to put down the rebellion, following the capture of fort sumter, and the virginia convention voted to declare secession from the union. <P4-S2> (in the western counties, where there was little slavery, pro-union sentiment remained strong, and they presently seceded from virginia as a separate union state, west virginia.) <SEP> <P5-S0> In a referendum on 23 June 2016, 51.9% of the participating UK electorate voted to leave the EU, out of a turnout of 72.2%. <P5-S1> On 29 March 2017, the UK government invoked Article 50 of the Treaty on the European Union. <P5-S2> The UK is thus due to leave the EU on 29 March 2019.