The Crimean War set Russia against the alliance of the Ottoman Empire, France, the UK, and Sardinia-Piedmont. It resulted from geopolitical tensions, including the decline of the Ottoman Empire and Russian expansion, with a trigger being a disagreement over the rights of Christian minorities in Palestine. Efforts to resolve the conflict peacefully failed, leading to military engagements and a war.

The first global war that took place in europe and across the Pacific, Middle East and parts of Asia. it was driven by many factors, including militralism, alliances, imperialism and nationalism. The war was fought between the two main alliances, the Triple Entente, which consisted of Britain, Fance and Russia, and the Triple Alliance, which consisted of Germany, Italy and Austria-Hungary. The assassination of the the Archduke Franz Ferdinand of Austria-Hungary in 1914 was a short term cause the sparked the war.

World War 2 is the continuation of the previous world war when Germany invade Poland

Which resulted in the atomic bombing of Nagasaki and Hiroshima....