Question

under president reagan, the united states began to develop the strategic defense initiative, nicknamed \star wars.\ what was the goal of that plan?
to build up the nations defenses
to strengthen the nations offensive power
to support the nations space program
to continue the policy of détente

Explanation:

The Strategic Defense Initiative (SDI or "Star Wars") under Reagan aimed to develop a missile defense system to protect the US from incoming nuclear missiles, which is about building up national defenses. Offensive power was not its focus, it wasn't for space program support (though it had space - related tech), and détente was declining during this time.

Answer:

A. to build up the nation's defenses