Following the 1911 Supreme Court ruling that found Standard Oil was an illegal monopoly, the company was broken up into 39 different entities, divided primarily by region and activity. Many of these companies later became part of the Seven Sisters, which dominated global petroleum production in the 20th century, and became a majority of today's largest investor-owned oil companies, with most tracing their roots back to Standard Oil. Some descendants of Standard Oil were also given exclusive rights to the Standard Oil name.