Tin, the basis for the state's wealth, was once taken from diggings that claimed to be the largest such mines in the world.
A lot of tin was sold to other countries during the 20th century.
mnli hypothesis: A lot of tin was sold to other countries during the 20th century. premise: Tin, the basis for the state's wealth, was once taken from diggings that claimed to be the largest such mines in the world.