Final answer:
Great Britain was the most influential country in the development of industrialization, pioneering new manufacturing techniques in the eighteenth century. Other notable nations, like Belgium, Germany, and the United States, followed Britain's lead, with industrialization spreading across Europe and North America by the mid-nineteenth century.
Step-by-step explanation:
The country most influential in the development of industrialization was Great Britain. It initiated the Industrial Revolution in the eighteenth century, establishing new manufacturing processes in industries such as textiles and iron, and creating machinery like spinning jennies and flying shuttles.
Great Britain's prominent role in technological innovation was further demonstrated during The Great Exhibition of 1851, which inspired other nations to pursue industrialization. Belgium was the first nation on the European mainland to follow Britain's example, utilizing its geographical advantages and skilled workforce, despite British efforts to hinder the spread of their technology.