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In the 1900's gasoline was important for the cars because it was easier to use and could travel further.
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In the 1910's cars got folding tops, this helped protect them from rain.
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In the 1920's cars had breaks, this helped cars evade even minor accidents.
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In the 1930's cars got major upgrades such as, synchromesh transmission. This helped with smooth transitions in gears.
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The new 1940's cars had a lower, longer, broader, and more massive look.
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In the 1950's cars got essentials such as air conditioning, auto transmissions, power steering and braking.
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In the 1960's car's alternators were essential.
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In the 1970's, low speed bumpers were essential in a car.
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In the 1980's there were a few new technological and stylistic developments. This included the supercharger that allowed a modification to the engine intake to increase the overall engine performance, the introduction of the Minivan and the compact SUV.
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In the 1990's automakers met new emissions and economy standards with fuel injection, multivalve heads, and solid-state ignitions, and with those technologies came power and acceleration.
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In the 2000's cars were very "sport" like.
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In the 2010's many cars had powerful engines such as V6's and V8's etc.