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Announces the Strategic Defense Initiative (SDI) in nationwide address

In a nationally televised speech, Reagan proposed the Strategic Defense Initiative, a major research effort to develop space- and ground-based systems to protect the United States from strategic ballistic nuclear missiles.

Announces the Strategic Defense Initiative (SDI) in nationwide address

SDI represented a significant shift in U.S. nuclear strategy, driving large-scale defense research, influencing arms-control negotiations, and prompting strong reactions from the Soviet Union and U.S. allies.

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