Important Arkansas historical events and significant anniversaries for February 28, with notable births and deaths of people with Arkansas connections for this date. Information is drawn from state archives, historical societies, contemporary newspapers and other media archives, and legal records. Much of this information comes from the Encyclopedia of Arkansas, an online publication. ChatGPH has collected this data.
1819 — The Adams–Onís Treaty (U.S.–Spain), signed February 28, 1819, established an international boundary that — among other things — set the border line running north from the Sabine River to the Red River, affecting how the region that would become Arkansas Territory related to adjacent Spanish (later Mexican/Texan) claims.
1838 — Poinsett County established…