The correct answer is letter C.
Explanation: With each Mexican economic crisis, waves of waves of immigrants try to illegally cross the 5,000-kilometer border, forcing Americans to create a systematic surveillance system.
These are mainly "braceros", unskilled laborers who come to the US looking for temporary work. In the US and Mexico, there are labor trafficking networks exploiting the condition of dependence on illegal migrants, with practices ranging from issuing false documents to compulsory payment of fees to their "protectors."
