An Americano is a normal cup of ESPRESSO with water added. It's a common drink in north american cafes and is similar to a "long black" in Australia and other places. Supposedly it's called that because GIs in Italy during WWII would get it/do it because they wanted a larger cup of coffee.
Most coffee in the North America is drip which has a similar strength to an Americano. If you go to a Dunkin' Donuts, Tim Hortons, McDonald's, most cafes and ask for just a coffee they will give you drip.