aug 20, 1920 - Ratification of the 19th Amendment
Description:
After nearly 7 decades, women had gotten the right to vote, of any race (thanks to the 15th amendment) as by 1916, mainly all suffrage organizations were united in the goal of their cause becoming an constitutional amendment.
Sources: https://www.ourdocuments.gov/doc.php?flash=false&doc=63
Added to timeline:
Suffrage Timeline - Jonathan R.
Date: