Drip coffee makers have been popular in the United States since the 19th century. They use filters. According to the technology, hot water penetrates through the layer of ground coffee on the filter. Therefore, coffee brewed in a drip coffee maker is called filter coffee. In all the bars of America, visitors were offered the so-called "Joe mug" - a container with 220 ml of filter coffee, which took 5-7 minutes to prepare.
At the end of World War II, American soldiers liberating Italy from the Nazis tortured local bartenders with demands to prepare a "cup of Joe". Espresso, beloved by Italians, seemed too strong to Americans, and servings of 30 ml after a large cup of filter coffee were completely ridiculous. Especially for Americans, espresso began to be diluted with hot water and served in latte cups. And in order to make it easier for military men who do not know Italian to order a diluted espresso, they began to call it americano. Paradoxically, America only really discovered Americano coffee in the 1990s, when the drink appeared on the Starbucks menu.
A misunderstanding arose: although drinks differ from each other in taste and preparation method, some baristas still confuse American coffee, that is, filter coffee, and Americano, diluted espresso.