Lead Up to WW1 Timeline

Goes as far back as 1839 to the declaration of WW1,
Sources:
https://www.thoughtco.com/world-war-1-timeline-pre-1914-1222102
http://ww1.canada.com/battlefront/a-chronology-of-the-events-that-led-to-the-start-of-the-first-world-war