Answer:
Lincoln-Douglas debates, series of seven debates between the Democratic senator Stephen A. Douglas and Republican challenger Abraham Lincoln during the 1858 Illinois senatorial campaign, largely concerning the issue of slavery extension into the territories.
Explanation:
C and D maybe A but I'm not that sure
At the end of the Civil War, the communication system that the
railroad used to coordinate their complex flow of rail cars is through the
telegraph. This is used for transmitting messages with the use of a wire in
which is a way of making signals in means of breaking and making an electrical
connection.
