The dollar, or monetary unit and standard unit of currency in the U. S. monetary system, was modeled after

Spanish peso.

Explanation:

During the colonial period, the word 'dollar' was often used and referred to a measure of around eight-piece coin in the Spanish-American colonies. Later in 1792, the Congress adopted the United States Dollar as the country's monetary unit and standard unit of currency. Thus, the dollar, or monetary unit and standard unit of currency in the U. S. monetary system, was modeled after the Spanish peso.