{"type":"rich","version":"1.0","title":"Westward Expansion Events","description":"Sequencing key historical events of U.S. Westward Expansion, including the Louisiana Purchase, Lewis and Clark Expedition, Oregon Trail, California Gold Rush, Transcontinental Railroad, and Oklahoma Land Rush.","author_name":"Padlet Arcade","thumbnail_url":"https://arcade.padlet.com/open-graph/social-preview-image.png?timestamp=1780555203953&hashid=6AKEmEmQK5","html":"<iframe src=\"https://arcade.padlet.com/embed/6AKEmEmQK5\" width=\"720\" height=\"480\" frameborder=\"0\" allowfullscreen></iframe>","width":720,"height":480,"provider_name":"Padlet Arcade","provider_url":"https://arcade.padlet.com"}