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Mass production of steel, large suspension bridges, steel frame construction in buildings. It allowed impurities to be removed cheaply and easily, enabling steel to be produced in mass quantities.
Ronald Reagan<span> addressed the nation and proposed that the United States develop new antimissile technology that would protect the United States from nuclear missile attacks. Reagan’s speech marked the beginning of what came to be known as the controversial Strategic Defense Initiative (SDI).</span>
Answer:
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