Question: When did the maker of the Acura EL, the company that owns Scion, and Nissan, open US assembly plants?

seattle remained the corporate headquarters of boeing until 2001, when the company separated its headquarters from its major production facilities; the headquarters were moved to chicago. the seattle area is still home to boeing's renton narrow-body plant (where the 707, 720, 727, and 757 were assembled, and the 737 is assembled today) and everett wide-body plant (assembly plant for the 747, 767, 777, and 787). the company's credit union for employees, becu, remains based in the seattle area, though it is now open to all residents of washington. <SEP> It was designed as an extension of its efforts to appeal towards younger customers. The Scion brand primarily featured sports compact vehicles (primarily badge engineered from Toyota's international models), a simplified "pure price" model, and eschewed trim levels in favor of offering a single trim for each vehicle with a range of factory and aftermarket options for buyers to choose from to personalize their vehicle. The "Scion" name, meaning the descendant of a family or heir, refers both to the brand's cars and their owners. The brand first soft launched in the United States at selected Toyota dealers in the state of California in June 2003, before expanding nationwide by February 2004. In 2010, Scion expanded into Canada. Scion is a discontinued marque of Toyota that started in 2003. In an effort to target the generation Y demographic, Scion primarily relied on guerrilla and viral marketing techniques. <SEP> the eighth generation was released in september 2005, for the 2006 model year. for the eighth generation, honda split the model into two different platforms, one for sedan and coupe, and one for a hatchback designed primarily for the european market using a simpler rear suspension from the honda fit and more aggressive styling. as of 2006, a total of 16.5 million civics had been sold worldwide, with 7.3 million of them in the united states. although the north american and the home market model differ externally, they are mechanically identical. the hatchback is available as a three and five - door. both si and type r trim levels continued although the japanese and european type r, while sharing the same engine size, are mechanically different. in the us, an improved, sportier version of the civic si 4 - door tuned by tuner mugen was offered, featuring cosmetic alterations and changes to the suspension, wheels, slight exterior differences, and exhaust system. a canadian only acura model received a new nameplate, changing from the acura el to the acura csx. the end of this model generation also marked a hiatus of the civic type r in japan, with no successor model until the later tenth generation, going on sale mid-2017. <SEP> The Acura EL is a subcompact executive car that was built at Honda's Alliston, Ontario, plant, and also the first Acura built in Canada. The EL is a badge-engineered Honda Civic with a higher level of features. <SEP> A decade after the 1973 oil crisis, Honda, Toyota and Nissan, affected by the 1981 voluntary export restraints, opened US assembly plants and established their luxury divisions (Acura, Lexus and Infiniti, respectively) to distinguish themselves from their mass-market brands. Some buyers lamented the small size of the first Japanese compacts, and both Toyota and Nissan (then known as Datsun) introduced larger cars such as the Toyota Corona Mark II, the Toyota Cressida, the Mazda 616 and Datsun 810, which added passenger space and amenities such as air conditioning, power steering, AM-FM radios, and even power windows and central locking without increasing the price of the vehicle.