On which U.S. chart did Metallica's 1991 album first reach number one?

Metallica's 1991 album first reached number one on the Billboard 200. It was the band's first album to top that U.S. albums chart.

The album debuted at number one and sold 598,000 copies in its first week in the United States. It remained at the top of the Billboard 200 for four consecutive weeks, helping establish Metallica as a mainstream rock act rather than only a major heavy-metal band.

The Billboard 200 ranks albums and extended releases, so it is different from the Billboard Hot 100, which ranks individual songs. “Enter Sandman” reached number 16 on the Hot 100, but that is a separate chart result. The album also topped charts in several other countries, including the United Kingdom, Australia, Canada, Germany, and Sweden.