Increased centralization of US government

Conduct an examination of how increased centralization of US government influence at the federal level has impacted election turnout at the sub-national, or second-order level. What does the literature dealing with election turnout and increased centralization of US Federal government saying on this topic.

A centralized government (also united government) is one in which both executive and legislative power is concentrated centrally at the higher level as opposed to it being more distributed at various lower level governments.