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</html><thumbnail_url>https://www.mapofthemonth.com/site/wp-content/uploads/2018/05/revised-blog-opener-lewis-and-clark.png</thumbnail_url><thumbnail_width>768</thumbnail_width><thumbnail_height>300</thumbnail_height><description>Lewis and Clark set out in May of 1804, westward to reach the Pacific coast. President Thomas Jefferson commissioned the expedition to explore and map the new Louisiana Purchase. Jefferson also wanted to establish a presence in this area, before other European powers tried to claim it.</description></oembed>
