In the 1980s iran had a war with iraq, both had oil, how did u. s. choose which to support?

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people say u. s. does everything for money n oil which is false. instead how chose in this case? for oil both same so how?
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and the answer is... iran attacked iraq so u. s. helped the victim same as kuwait same as korea same as vietnam same as israel. do you see a pattern?
"the war had begun on September 4, when Iran shelled a number of border posts." pretty vague for an encyclopedia but the author hated iraq.
In the 1980s iran had a war with iraq, both had oil, how did u. s. choose which to support?
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