Uruguay ends military rule
On August 9, 1977, the military government of Uruguay in 1981 announced that it would hold free elections to return the country to civilian rule.
US and Britain signed Webster-Ashburton Treaty
On August 9, 1842, the United States and Great Britain signed the Webster-Ashburton Treaty, settling their dispute over the northern boundaries of Maine and Minnesota.
Read the full text of the treaty, online from the Avalon Project at Yale Law School.