Starting with the 2000 United States presidential election, the terms "red state" and "blue state" have referred to U.S. states whose voters vote predominantly for one party — the Republican Party in red states and the Democratic Party in blue states — in presidential and other statewide elections. By contrast, states where the vote fluctuates between the Democratic and Republican candidates are known as "swing states" or "purple states". Examining patterns within states reveals that the reversal of the two parties' geographic bases has happened at the state level, but it is more complicated locally, with urban-rural divides associated with many of the largest changes.