I think it's war but I'm not really 100% sure on it
Cyanobacteria, also known as "blue-green algae", are the unicellular organisms which are able to produce oxygen.
Approximately 540 years ago, the atmosphere was very poor on oxygen. Cyanobacteria are thought to be responsible for the oxidization of the atmosphere back then, in an event known as <em>"The Great Oxygenation Event"</em>. As a result, Earth's life forms suffered drastic changes in their composition, as they evolved from being <em>anaerobic</em> to becoming organisms <em>highly dependant</em> on oxygen. The oxygenation of the atmosphere would eventually provide the adequate environment in order for the <em>Cambrian Explosion</em>, or the first diversification of living organisms, to happen.
Franco-German War, also called Franco-Prussian War, (July 19, 1870–May 10, 1871), war in which a coalition of German states led by Prussia defeated France. The war marked the end of French hegemony in continental Europe and resulted in the creation of a unified Germany.
They mainly had Monarchy goverments.
