Greenbacks: America's First Fiat Currency

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The Legal Tender Act of February 1862 authorised the United States government to issue paper notes — "greenbacks," named for the green ink used on the reverse — not backed by gold or redeemable in specie, but declared legal tender by government decree. It was the first nationally issued fiat currency in American history, created under financial duress as the Civil War's costs overwhelmed existing revenue capacity.
The Fiscal Crisis of 1861

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The Union government entered the Civil War with limited financial resources. The federal government was small, with annual revenues of approximately $80 million and debt well below the scale needed to fund industrial-scale warfare. Initial financing through bond sales proved inadequate: Secretary of the Treasury Salmon Chase's early bond issues sold at steep discounts as financial markets priced in war risk.
Chase's demand deposit agreement with commercial banks collapsed in December 1861 when a bank run depleted gold reserves and banks suspended specie payments. The government could no longer reliably convert its obligations to gold. Facing a fiscal crisis mid-war, Congress authorised the greenback as an emergency measure.
The Greenback's Mechanism

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Greenbacks were declared legal tender for all debts, public and private — except customs duties (still payable in gold) and interest on government bonds (also paid in gold, to maintain the credit of new bond issuances). The exclusions were significant: they preserved gold's monetary role in the sectors the government most needed to function while using paper for ordinary commerce.
By war's end, $450 million in greenbacks were in circulation. Their value fluctuated against gold: during Confederate military successes, the gold premium on greenbacks expanded (greenbacks worth less in gold terms); after Union victories, it contracted. In July 1864 — the war's darkest financial moment — it took $2.85 in greenbacks to buy $1 in gold.
The Post-War Deflation Debate

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After the war, a fierce political debate erupted over what to do with the greenbacks. "Hard money" advocates (creditors, Eastern financial interests) wanted greenbacks retired and a return to gold at pre-war parity, which required deflation — reducing prices until they matched the pre-war gold price. "Soft money" advocates (debtors, Western farmers) wanted the greenbacks maintained or expanded.
The deflation ultimately prevailed: the Resumption Act of 1875 committed to restoring gold convertibility by 1879. The subsequent deflation was severe, contributing to the agrarian discontent that produced the populist movement of the 1880s and 1890s and William Jennings Bryan's "Cross of Gold" speech.