This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help.
Summary
Description1928 House Elections in the United States.png
English: This maps shows the results of the 1928 House Elections in the United States.
Other information
Unlike the one used on the forum, this version uses red for Republicans and blue for Democrats.
Date
Source
The Forum
Author
Jackson of Dave Leip's Atlas Forum
Permission (Reusing this file)
Evidence: The license statement can be found online at: http://uselectionatlas.org/FORUM/index.php?topic=137677.550
Licensing
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.