Question: When did Nissan, the Acura Legend maker and the Scion owner open US assembly plants?

<P0-S0> 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. <P0-S1> 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). <P0-S2> 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> <P1-S0> The Acura Legend is a mid-size luxury/executive car manufactured by Honda. <P1-S1> It was sold in the U.S., Canada, and parts of China under Honda's luxury brand, Acura, from 1985 to 1995, as both a sedan, which was classified as a full-size car, and a coupe, which was classified as a mid-size car (similar to how the Honda Accord is set up today). <P1-S2> It was the first flagship sedan sold under the Acura nameplate, until being renamed in 1996 as the Acura 3.5RL. <P1-S3> The 3.5RL was the North American version of the KA9 series Honda Legend. <SEP> <P2-S0> Scion is a discontinued marque of Toyota that started in 2003. <P2-S1> It was designed as an extension of its efforts to appeal towards younger customers. <P2-S2> 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. <P2-S3> The "Scion" name, meaning the descendant of a family or heir, refers both to the brand's cars and their owners. <P2-S4> 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. <P2-S5> In 2010, Scion expanded into Canada. <P2-S6> In an effort to target the generation Y demographic, Scion primarily relied on guerrilla and viral marketing techniques. <SEP> <P3-S0> by the early 1960s, the us had begun placing stiff import tariffs on certain vehicles. <P3-S1> the so - called ``chicken tax ''of 1964 placed a 25% tax on imported light trucks. <P3-S2> in response to the tariff, toyota, nissan motor co. and honda motor co. began building plants in the us by the early 1980s. <SEP> <P4-S0> 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. <P4-S1> 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.