The Nasdaq 100 is the United States stock market index that includes the 100 most important technology companies in the United States, by market capitalization and turnover.
It was created in 1985 and although most of the companies listed on it are American, foreign companies are also listed on it, such as Baidu from China and MercadoLibre from Argentina.
You can see the comparative of the quotation and evolution of the different world indexes in Indexes Exchanges.