Results of the United States dropping two atomic bombs on Hiroshima and Nagasaki?

Which one of the following statements best characterizes change to agriculture in the united states since 1900

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.

What are some inventions during the han dynasty?