What happens if the federal government refuses to enforce immigration law and a state is disproportionately impacted by illegal immigration practices?

Legal Issues in Homeland Security (HSE-400-00403)

This is a post 250 words concerning the enforcement of immigration law in the United States, consider the following:

Should states have the authority to enact and enforce immigration laws within their borders (Consider the case law and legal theory behind immigration enforcement in the United States)?

What happens if the federal government refuses to enforce immigration law and a state is disproportionately impacted by illegal immigration practices?