Well, the use for the atomic bomb was that it was dropped on Hiroshima and Nagasaki to end the war (With Japan at least) The rest are technically true, but that wasn't really it's use. So A is you best bet here:)
Building block for our country
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The Iraq War was a protracted armed conflict that began in 2003 with the invasion of Iraq by a United States-led coalition that overthrew the government of Saddam Hussein. ... The invasion occurred as part of the George W. Bush administration's War on Terror, following the September 11 attacks.
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the people did everything for them and tried to please them.
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Answer: It's because the song is marked by its strong tone of determination in the struggle of freedom.
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