It is thought that the americano coffee was first made during World War 2 when American soldiers based in Italy found the coffee too strong to drink. They added hot boiling water to the strong Italian coffee to dilute the strength. The americano allows the coffee drinker to slowly savour the coffee while the added water takes the edge off the intensity of the straight up espresso. The americano is often confused with regular drip coffee however it should be made fresh every time. It is one way to ensure that the coffee that you order is going to be fresh.
The video below shows how to prepares an americano coffee
Preparing an Americano