Answer:
By causing people to scapegoat others for their problems.
Step-by-step explanation:
A trend that has occurred many times in history is that when unemployment rises, people want someone to blame. Oftentimes this has meant that they blame immigrants, who the unemployed view as "taking their jobs." This blame leads to feelings of fear and anger towards those other groups, which is essentially what xenophobia is. While never really the case that immigrants are taking the jobs, this is a common trend.