Question: When did the country where Apache helicopters are based in the country that recently voted to leave an example of a federal union go to war with Egypt?

<P0-S0> the confederate states of america had an agrarian - based economy that relied heavily on slave - worked plantations for the production of cotton for export to europe and the northern us states. <P0-S1> if ranked as an independent nation, it would have been the fourth richest country of the world in 1860. when the union blockaded its ports in summer 1861, exports of cotton fell 95 percent and the south had to restructure itself to emphasize food and munitions production. <P0-S2> after losing control of its main rivers and ports, it had to depend on a weak railroad system that, with few repairs being made, no new equipment, and federal raids, crumbled away. <P0-S3> the financial infrastructure collapsed during the war as inflation destroyed banks and forced a move toward a barter economy for civilians. <P0-S4> the government seized needed supplies and livestock (paying with certificates that were to be paid off after the war, but never were). <P0-S5> by 1865 the economy was in ruins. <SEP> <P1-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%. <P1-S1> On 29 March 2017, the UK government invoked Article 50 of the Treaty on the European Union. <P1-S2> The UK is thus due to leave the EU on 29 March 2019. <SEP> <P2-S0> when we go to war is a 2015 television drama mini-series from new zealand. <P2-S1> the series uses fictional characters to depict the impact of the first world war on new zealanders at home as well as in the new zealand expeditionary force during the gallipoli campaign and in egypt. <SEP> <P3-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). <P3-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. <P3-S2> They are located in Britain, Brunei, Canada, and Germany. <P3-S3> Some AAC squadrons provide the offensive and air assault elements of 16 Air Assault Brigade through Joint Helicopter Command. <SEP> <P4-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'. <P4-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. <P4-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. <P4-S3> One or other level of government could be sovereign to decide such matters, but not both simultaneously. <P4-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'. <P4-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. <P4-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. <P4-S7> Leading examples of the federal state include the United States, Germany, Canada, Switzerland, Australia and India. <P4-S8> The leading example of the federal union of states is the European Union. <SEP> <P5-S0> The Suez Crisis or the Second Arab -- Israeli War also named the Tripartite Aggression (in the Arab world) and Operation Kadesh or Sinai War (in Israel), was an invasion of Egypt in late 1956 by Israel, followed by the United Kingdom and France. <P5-S1> The aims were to regain Western control of the Suez Canal and to remove Egyptian President Gamal Abdel Nasser, who had just nationalized the canal. <P5-S2> After the fighting had started, political pressure from the United States, the Soviet Union, and the United Nations led to a withdrawal by the three invaders. <P5-S3> The episode humiliated Great Britain and France and strengthened Nasser.