Political map of the Arctic & the Far North 28 February 1825 (Anglo-Russian Convention): Britain and the United States followed their 1818 treaty (Treaty of 1818) by defining their boundaries with Spain and Russia. The Spanish, with their American empire already crumbling (Spanish American wars of independence), abandoned their claim to the Pacific Northwest (Adams%E2%80%93On%C3%ADs Treaty), while the Russians agreed to withdraw from Oregon Country (Russo-American Treaty of 1824) and restrict themselves to what is now Alaska (Treaty of Saint Petersburg (1825)). However limited knowledge of the region meant that the southern border between Russian and British America was poorly defined and would later lead to the Alaska boundary dispute.