What was the result of the lincoln-douglas debates? a. the kansas-nebraska act was repealed. b. john brown attacked a federal arsenal. c. lincoln was elected to the senate to represent illinois. d. lincoln gained national attention.

I'd say the answer is

D. Lincoln gained national attention.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

c) troops march forward in close formation against newer, more accurate weapons