Donald Trump’s claims of a rigged election has put a spotlight on the intricacies of the process of voting in the United States.

There is no centralized governance of American elections, except the Voting Rights Act of 1965, which enforces the 15th Amendment, affirming the right to vote no matter “race, color, or previous condition of servitude.” And the 26th Amendment sets 18 as the minimum voting age.

Otherwise, it’s left up to individual states to establish its own rules for such things as registering to vote, methods of voting, and challenging voter credentials.

Republicans and Democrats will have official poll watchers deployed across the country to look for voting irregularities. But Trump has urged supporters to do so on their own to ensure the election “is not stolen” from him. Democrats are concerned that will cause voter harassment and suppression.

The rhetoric about rigging the election and suppressing the vote is adding stress to an already emotionally-chargbed campaign.