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.
There is another question also here on Quora about reducing Autocad file size. After a lot of thought I decided not to merge them. I will write a common answer here and share the link on the other question. Objective : to reduce the file size of an Autocad .dwg file. This answer is specific to that objective so it excludes converting to .pdf etc. There can be two separate objectives within this to reduce the file size so my below is in two parts.