In Germany (1800-1914), (choose 1-3 factors: ethnicity and race, working conditions, immigration, military conflict, and economic stability) (caused or resulted) in (global event)

For military conflict you can talk about Germany's increasing military development. Before WW1 alliances were key so you can talk about Germany being in an alliance with Austria Hungary caused a major conflict when Archduke Franz Ferdinand was assassinated and the alliances went against each other,

For working conditions were horrible, there was 40 plus work hours, the factories were full of dust and there were a lot of accidents that occurred.

Due to German imperialism Germany wanted to have more territory and gain more money even before WW1. You can say that increased imperialism fueled the flames of WW1 because Germany's neighbors were preparing for imminent war.