I'm new to ACS data and this seems like a basic question I should've found answered elsewhere, but reading documentation and googling came up fruitless... so please humor me!
I'm doing an independent study on (mostly racial) demographics for US federal elections. I believe using 1-year estimates is appropriate for this, since I'm looking to note biennial trends/changes.
What I'm not sure about is which year data I should use. For example, for the November 2016 election, should I use 2016 or 2017 ACS data? Ultimately, I suspect the most important thing is that I'm consistent, but if there is any guidance on this, I would definitely love to hear it.