What was james watt's contribution to the industrial movement? he built the first railroad locomotive. he designed a riverboat that traveled a distance of 150 miles. he made the steam engine more efficient. his innovation made water power essential for mills.

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.