2009 was a pivotal turning point when things in the trading world took a different path. Satoshi Nakamoto came up with something that nobody had ever seen before - bitcoin.
Bitcoin was the first currency that got released, followed by many other ones later.
Before bitcoin got released, people would trade forex only. With the cryptocurrencies appearing, another excellent opportunity came up. 
Source: https://www.entrepreneurshipsecret.com/how-to-trade-bitcoin/