References
Videos for further learning
History of the Morse telegraph
The Surprisingly Short History of the Pony Express
The Mexican-American War in 16 minutes.
After the fall of Napoleon Bonaparte, movements arose throughout Europe for the emancipation of nations and improvement in the conditions and rights of ordinary citizens
The First War To Be Photographed, The Crimean War
Why did Russia sell Alaska to America?
Italian and German Unification
The Electrical Telegraph
https://www.loc.gov/collections/samuel-morse-papers/articles-and-essays/invention-of-the-telegraph/
The Mexican American War
The Revolutions of 1848
https://www.age-of-the-sage.org/history/1848/revolution_of_1848.html
https://www.age-of-the-sage.org/history/1848/french_revolution_1848.html
The Crimean War
http://www.inventingeurope.eu/story/eye-witnessing-the-war-in-the-crimea-telegraph-vs-camera