What year was all gold backing removed from the US dollar bill?

August 15, 1971 by President Richard Nixon. It was supposed to be a temporary suspension that just never got reinstated. It was suspended because other countries suspected the US of printing more money than we had Gold reserves. The idea was that other countries could back their currencies with dollars instead of gold since the dollar was backed by gold. Once the gold standard was suspended all currencies became Fiat currencies. If the US economy collapses and the dollar hyper inflates the economy of the world will also collapse. And most currency will become worthless. See End of the Road: How Money Became Worthless for more information.