Americanism (noun)

An idiom, custom, or characteristic feature of American English or of the United States and its culture.

Origin:

Mid 19th century: from american + -ism.

Examples:

1. The use of the word "gotten" is considered an Americanism.
2. The phrase "have a nice day" is an Americanism.
3. The custom of trick-or-treating on Halloween is an Americanism.
4. The use of the word "soccer" for association football is an Americanism.
5. The concept of "Black Friday" is an Americanism.