Congressional redistricting occurs every 10 years as congressional boundaries are redrawn after the Census. Article One of the Constitution states that "the Times, Places and Manner of holding Elections for Senators and Representatives, shall be prescribed in each State by the Legislature thereof; but the Congress may at any time by Law make or alter such Regulations." Currently, the process of drawing congressional districts is for the most part under state control, although the Voting Rights Act places some restrictions.[29]