During this decade, former Georgia governor George Mathews asked the slave Tony Proctor to garner native support for a war against Spain, but Proctor used a native language to (15[3])warn chiefs not to (15[3])trust the US. Early in this decade, some plantation owners invaded Amelia Island (-5[1])and declared the (15[1]-5[1])Republic of East Florida. The ambiguously worded (15[1])Article Nine of (-5[1])a treaty signed in this decade enabled the US (15[1])to take over (10[1])native land (10[1])which was formerly a British-backed buffer zone in the west. At the end (15[1])of this decade, (10[1])(*) Florida (10[1])was ceded to the US (10[2]-5[1])in the Adams-Onís (10[2])treaty. (10[3])In (-5[1])this decade, the Creek confederacy (-5[1])was forced to give up much (-5[1])of Alabama by Andrew (10[1])Jackson. For 10 points, (10[1])in which decade was the Treaty (10[2])of Ghent signed just before the battle of (10[1])New (10[2])Orleans? (10[1])■END■ (10[1])