Of course you knew this

From a study by the Center for Economic and Policy Research

The United States is the only advanced economy in the world that does not guarantee its workers paid vacation. European countries establish legal rights to at least 20 days of paid vacation per year, with legal requirement of 25 and even 30 or more days in some countries. Australia and New Zealand both require employers to grant at least 20 vacation days per year; Canada and Japan mandate at least 10 paid days off. The gap between paid time off in the United States and the rest of the world is even larger if we include legally mandated paid holidays, where the United States offers none, but most of the rest of the world's rich countries offer between five and 13 paid holidays per year.

In the absence of government standards, almost one in four Americans have no paid vacation and no paid holidays. According to government survey data, the average worker in the private sector in the United States receives only about nine days of paid vacation and about six paid holidays per year: less than the minimum legal standard set in the rest of world's rich economies excluding Japan (which guarantees only 10 paid vacation days and requires no paid holidays).