How did inventions help to change the way warfare was conducted in Europe?

Which of the following descriptions is an example of the curtual diffusion

Between 1870 and 1916, approximately how many immigrants came to the united states? 10 million 25 million 75 million 125 million

By choosing to resupply fort sumter, abraham lincoln risked a. abandonment of the fort by union soldiers. b. abandonment of the fort by confederate soldiers. c. the appearance of giving in to confederate secession. d. armed conflict with southern soldiers.