Fort Astoria
Built at the entrance of the Columbia River in 1811 , Fort Astoria was the first American-owned settlement on the Pacific coast of North America . 
<triplet> Columbia River <subj> American-owned <obj> country <subj> North America <obj> continent <triplet> Fort Astoria <subj> American-owned <obj> country <triplet> American-owned <subj> North America <obj> part of <triplet> North America <subj> American-owned <obj> has part