How was Hjalmar Branting awarded the Nobel Prize Peace?

Name: Hjalmar Branting.
Country: Sweden.
Date of Birth: 23 November 1860.
Died: 24 February 1925.
Education: Stockholm and Uppsala University.
Prime Minister: Swedish Delegate, Conseil de la Société des Nations.
Founder: Swedish Social Democratic Party.
Noble Prize Year: Nobel Prize for Peace in 1921, for their lifelong contributions to the cause of peace and organized internationalism.