Page Slugs
#Use Hyphens, Not Underscores
By default - NationBuilder will auto-generate any new pages using underscores (_) - for SEO purposes we recommend instead to use hyphens (-).
The following excerpt from searchenginejournal.com explains why:
Always use hyphens (-) and not underscores (_) because underscores cannot be seen when the URL is published as a bare link.
Here’s an example of how underscores in links are a bad practice:

Underscores are invisible when formatted in a link. This means that users are unable to accurately see what the URL is.
NationBuilder and macrons
Macrons (ā, ē, ī, ō, ū) are an important part of te Reo Māori - unfortunately support for them across the internet and on NationBuilder are not 100%.
When you create a NationBuilder page and the name contains a macron - Nationbuilder will replace it with an underscore (_).
See the example before for the page slug that gets generated automatically when i go to create a page titled "Te Reo Māori" in NationBuilder.
For better readability and SEO purposes - we recommend that you modify this auto-generated slug - like in the example below.