Every industry has its moment when some player changes the landscape with radical new thinking, design, technology or features. The changes may not happen overnight, but that product's influence is nonetheless great. What car marked the greatest leap forward?

Obviously, the Model T is easily the most influential car of its century, for its accessibility, ease of repair, durability and paradigm-shifting influence on American life. Let's get that one out of the way to make room for the less-obvious ones. (And, of course, apologies for the title to the Maoists among us.)

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