The Statue of Liberty, the United States of America and the bald eagle - all 3 symbols stand for independence, freedom, strength and power! On the back, you see the U.S. dollar which is also affectionately called ;greenback' because of its green color scheme. A detailed explanation of why the back of the banknotes of the USA were printed in green ink does not exist. However, it is known that in 1929, the green dye was present in large amounts and it was relatively resistant to chemical and physical changes in the way of preparation. Furthermore, the color green, the strength and stability of the government to express and create confidence in the currency. But one thing is certain: Gold is the ultimate form of payment system in the world!