By 1870, by far the largest producer of pig iron was

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Great Britain was the largest producer of pig iron by 1870, as it had pioneered the use of coke in iron production and had a large supply of iron ore and coal. The United States would surpass Great Britain as the largest producer of pig iron later in the 1800s. Imperial Germany did not become a unified country until 1871, and its iron production did not surpass that of Great Britain until the 1890s. France and Russia were not major producers of pig iron in the 1800s.

By 1870, by Far the Largest Producer of Pig Iron