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