NILES' WEEKLY REGISTER, Baltimore, Sept. 11, 1819  Inside has excerpts from the recently published "Declaration of the Independence of Texas" which concerns the Adams–Onís Treaty, signed in type: James Long, President of the Supreme Council.
Sixteen pages, 6 by 9 1/2 inches, very nice condition.

Background: This September 11, 1819 issue of Niles’ Weekly Register represents an exceptionally rare primary source printing of the first Texas Declaration of Independence—a monumental document in Southwestern and American expansionist history. Following the 1819 Adams–Onís Treaty, in which the United States relinquished its territorial claims to Texas in exchange for Florida, outraged American frontiersmen led by Dr. James Long launched a filibustering expedition into Nacogdoches and declared Texas a free republic on June 23, 1819. Signed in print by Long as "President of the Supreme Council," this report offered early 19th-century Americans their first detailed glimpse into the short-lived Republic of Texas, making it a cornerstone collectible for Texana and early American news paper enthusiasts. Because original 1819 standalone issues of Niles' Register covering specific Southwestern political upheavals are scarce—most having been rebound into full-year library volumes or lost to history—finding a complete, 16-page issue in clean, unrestored condition containing this pivotal declaration makes it a highly sought-after artifact with significant historical and market value.

As noted in Wikipedia, this title: "...(was) one of the most widely-circulated magazines in the United States...Devoted primarily to politics...considered an important source for the history of the period."