Which important contribution did james watt make to the industrial revolution

Improvement in steam engine technology

Explanation:

James Watt was a Scottish inventor and a mechanical engineer.In 1974 Watt was given a model Newcomen engine to repair. Newcomen engines were used to pump water from mines all over the country.When repairing he realized the it was hopelessly inefficient and he began to improve the design. He designed a separate chamber for the steam engine that prevented enormous losses of steam.Initially Newcomen engines was used by mine owners only but after Watt engineering the engines were extended to paper ,flour, cotton, distilleries, canals and waterworks.

b) the confederacy had to pay all union war expenses.