The document summarizes the history of the international monetary system, from the gold standard to the emergence of floating exchange rates. It discusses how the gold standard worked, with currencies pegged to gold at fixed rates and trade imbalances compensated by gold flows. It then explains how World War I disrupted this system and how the Bretton Woods system after World War II pegged currencies to the US dollar instead of gold. Finally, it describes how President Nixon ended the peg to the US dollar in 1971, causing other major currencies to float freely as well and establishing the current system of floating exchange rates.