The USSR and other Warsaw pact nations invaded
It's D to divide the confederacy, it wa part of the anaconda plan. Step 1, blockade ports to prevent outside help. Step 2, split the south in half at the mississippi river (the battle of vicksburg was to capture a major control point of the mississippi completing step 2). Step 3, march on the capital city.
The increased use of barbed wire fencing blocked cattle drives
I believe that the answer is B.
B, they where free by Abraham Lincoln
