How did advances in technology change the practice of mining during the gold rush?

What was president theodore roosevelt’s square deal

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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.

How big would a 1940s computer have to be in order to have the power of a modern personal computer?