Many more settlers began moving west with a. the completion of the transcontinental railroad. b. the passing of the indian appropriations act. c. the defeat of american indians at the battle at wounded knee. d. the institution of the reservation system.

A. the completion of the transcontinental railroad.

The First Transcontinental Railroad (also known as Pacific Railroad) was built between 1863 and 1869 by three private companies over public lands provided by US land grants. The railroad connected the western states and the northern Union states, transporting passengers and goods in a quick and less expensive way. It also led to many more settlers moving west.

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on