Aerica issued stamps for the first time in 2015. The Aerican Empire first issued coinage in November 2009, and a second coin was minted to celebrate Aerica's 25th anniversary in 2012.
The passage describes the introduction of currency by two entities: Aerica (stamps) and the Aerican Empire (coins).  Aerica issued its first stamps in 2015, while the Aerican Empire began issuing coins in November 2009. A second coin was minted to commemorate Aerica's 25th anniversary in 2012.