World War 1 happened first and World War 2 happened second.
Second world war
The Cold War began after the Second World War ended in Germany and Japan's defeat.
On 1 September, the Second World War started, when Germany attacked Poland.
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Second Messenian War happened in -685.
War of the Second Coalition happened in 1800.
Second Rohilla War happened in 1794.
Second Barons' War happened in 1264.
Second Carlist War happened in 1846.
Second Taranaki War happened in 1864.
Second Dacian War happened in 105.