(Repeats October 21 story with no changes to text) By Jamie McGeever ORLANDO, Florida, Oct 21 (Reuters) – The Trump administration has engaged in what appears to be the U.S. government's first ever unilateral foreign exchange intervention to support an emerging market currency – and the country in question is Argentina, a poster child for economic volatility. The Treasury on Thursday October 9 sold an unspecified amount of U.S. dollars for Argentine pesos, followed up with a second round of peso-buying intervention on Wednesday October 15, and a third the following day. All three rounds are part of the U.S. administration's broader package of measures to support Argentina's beleaguered economy and battered financial markets. The U.S. has a long history of offering emerging economies financ

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