Which was a difficulty the builders of the transcontinental railroad had to overcome? a. meeting the demands of skilled union workers b. providing supplies to build tracks and support workers c. bridging the grand canyon and rio grande river d. building on the wet, marshy soil of the great plains

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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