The US State Quarters program began in 1999 and ran until 2008.
Each state was featured on a quarter in the order they were admitted to the Union.
The program was incredibly popular, with over 140 million people collecting the coins.
The design for each state's quarter was chosen through a competition.
The US Mint produced over 34 billion State Quarters in total.
Some State Quarters have errors, such as the Wisconsin quarter with an extra leaf on the corn stalk.
The State Quarters program inspired other countries to create similar programs, such as Canada's Provincial and Territorial quarters.
The US Mint also released a series of quarters featuring National Parks and other sites.
The State Quarters program generated over $3 billion in seigniorage, which is the difference between the cost to produce the coins and their face value.
The State Quarters program was so successful that it led to the creation of other coin programs, such as the Presidential Dollar series.
Some State Quarters are more valuable than others, depending on factors such as rarity and condition.
The State Quarters program is a great way to learn about US history and geography.