Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 

Topic: 700 mile US Mexico border fence
 Argument: The 700 wall cannot be compared to the Berlin wall.
neutral

Topic: Bombing Hiroshima and Nagasaki
 Argument: Bombing Japan was ethical in context of the horrors of WWII.
in favor

Topic: High-speed rail
 Argument: High speed rail is a great tourist attraction.

in favor