Final answer:
Adrienne Marie Brown
Step-by-step explanation:
The quote “We will never obtain the social and economic structures we want if we don't vigilantly cultivate the ability to imagine [them]” was first said by Adrienne Marie Brown. If you have access to the internet, you may want to verify the quote's source through reliable databases or the latest information available. If this quote is part of a more recent development or publication after my last update, I might not have that information. I recommend checking the latest sources to get the most accurate and up-to-date attribution for the quote.