History of Europe

The developments in the cotton and iron industries made France leading industrial country until end of 19th century?

This statement is not accurate. Although developments in the cotton and iron industries contributed significantly to France's industrialization in the 19th century, France was not the leading industrial country until the end of the 19th century.

Britain is considered to have been the foremost industrial country during that time, primarily due to its pioneering role in the industrial revolution and its rapid industrial growth. Britain led the way in mechanization, technological advancements, and the exploitation of its abundant natural resources, mainly coal and iron, which fueled its industrial progress.

While France did experience considerable industrialization in the 19th century, its pace and extent lagged behind Britain and some other European nations like Germany and Belgium. France's focus on agriculture and its traditional sectors, such as textiles and luxury goods, meant that its industrialization occurred at a slower pace.