In 1979 the US Mint flooded the United States with the Susan B. Anthony dollar coins and created a great amount of confusion since this coin just happens to be the same size as the quarter.
It even was given the name "Carter's Quarter" since it happened during Jimmy Carter's time in office.
You would think that people would learn from their mistakes but not our government. Back in 1875 someone decided to mint a 20 Cent piece that also just happened to be the same size as the quarter. It caused as much grief as the 1979 mistake.
Almost 1 billion of the above pictured coin was produced that are really not any good for anything except confusion. I shudder to think how much it cost when that money could have been spent on schools or anything beneficial.
What were they thinking?