Declaration of the National Anti-Slavery Convention was written by William Lloyd Garrison for the formation of the American Anti-Slavery Society in December 1833. It was reprinted in The Liberator on December 14, 1833. It is now available in the Public Domain.
You can also use the Optimized PDF option to crank the size down in very targeted ways. Given the big before/after shift, the culprit is probably the image you're embedding. Try exporting that file in various formats (PDF, jpg, png) and then import it.
If you have an Acrobat question, ask questions and get help from the community. Problems when trying to Save As Reduced File Size. I have a large PDF (95 MB) that is slow to open on our Intranet so I am trying to do a Save As, Reduce File Size. On my PC it gets are far as subsetting embeded fonts then hangs up and closes out the PDF without giving me an error message.