It is unbelievable but the first successful attempt to create a carbonated soft drink was made more than 200 years ago when one of the famous English chemists (the inventor) had discovered the easy way to make carbonated water similar to the natural one. He just infused H2O with CO2! Soon the beverage became very popular, mostly because of the bubbles. People started to add sugar and natural flavorings (such as vanilla) to the mixture. Nowadays the invention is called "soda water".

More Info: en.wikipedia.org