Question: When did the make of Acura Legend, the company that made toyopet Master and Nissan open US assembly plants?

Knowledge 1: Toyopet Master
The Toyopet Master, introduced in January 1955, is a passenger car that was an update to the SF/RH model with a modernized body. As for its predecessor, it has a ladder frame with leaf sprung front and rear axles. The Toyopet Master was an evolution of an earlier Toyota sedan called the Toyota SF/RH model (also known as the Super), and was sold in parallel with the first Toyota Crown. The more conservative Master was introduced as a frugally equipped version meant for taxi usage. The Master and Crown shared the same R-series engine, which produces in the Master. It was sold at a chain of Toyota Japan dealerships called "Toyota Store", next to the more upscale Crown, which was intended as a private purchase alternative to the Master. [SEP] Knowledge 2: Toyota
By the early 1960s, the US had begun placing stiff import tariffs on certain vehicles. The so - called ``chicken tax ''of 1964 placed a 25% tax on imported light trucks. In response to the tariff, Toyota, Nissan Motor Co. and Honda Motor Co. began building plants in the US by the early 1980s. [SEP] Knowledge 3: Acura Legend
The Acura Legend is a mid-size luxury/executive car manufactured by Honda. 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). It was the first flagship sedan sold under the Acura nameplate, until being renamed in 1996 as the Acura 3.5RL. The 3.5RL was the North American version of the KA9 series Honda Legend.
Knowledge 1: Toyopet Master
The Toyopet Master, introduced in January 1955, is a passenger car that was an update to the SF/RH model with a modernized body. As for its predecessor, it has a ladder frame with leaf sprung front and rear axles. The Toyopet Master was an evolution of an earlier Toyota sedan called the Toyota SF/RH model (also known as the Super), and was sold in parallel with the first Toyota Crown. The more conservative Master was introduced as a frugally equipped version meant for taxi usage. The Master and Crown shared the same R-series engine, which produces in the Master. It was sold at a chain of Toyota Japan dealerships called "Toyota Store", next to the more upscale Crown, which was intended as a private purchase alternative to the Master. [SEP] Knowledge 2: 1973 oil crisis
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. 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. [SEP] Knowledge 3: Acura Legend
The Acura Legend is a mid-size luxury/executive car manufactured by Honda. 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). It was the first flagship sedan sold under the Acura nameplate, until being renamed in 1996 as the Acura 3.5RL. The 3.5RL was the North American version of the KA9 series Honda Legend.
Knowledge 1: 1973 oil crisis
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. 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. [SEP] Knowledge 2: Toyota
From September 1947, Toyota's small - sized vehicles were sold under the name ``Toyopet ''(トヨペット). The first vehicle sold under this name was the Toyopet SA, but it also included vehicles such as the Toyopet SB light truck, Toyopet Stout light truck, Toyopet Crown, Toyopet Master, and the Toyopet Corona. The word`` Toyopet (Japanese article)'' was a nickname given to the Toyota SA due to its small size, as the result of a naming contest the Toyota Company organized in 1947. However, when Toyota eventually entered the American market in 1957 with the Crown, the name was not well received due to connotations of toys and pets. The name was soon dropped for the American market, but continued in other markets until the mid-1960s. [SEP] Knowledge 3: Acura Legend
The Acura Legend is a mid-size luxury/executive car manufactured by Honda. 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). It was the first flagship sedan sold under the Acura nameplate, until being renamed in 1996 as the Acura 3.5RL. The 3.5RL was the North American version of the KA9 series Honda Legend.

Answer: 1981