How the introduction of a system of floating exchange rates?

Despite years of stable and rapid growth, not all was well in this post-war world. From the 1960s the rising costs of its overseas involvements weakened the US’s finances and competitive strength. The US dollar now no longer commanded confidence as the world’s principal currency. It could not maintain its value in relation to gold. This eventually led to the collapse of the system of fixed exchange rates and the introduction of a system of floating exchange rates.