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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The last world war that happened was the second world war which began in 1939 and ended in 1945. According to the Germans it was called the "Great War" since they lost the first one, which triggered an economic disaster. The second world war led to economic and military strength for the U.S..
Second Messenian War happened in -685.
Second Dacian War happened in 105.
Second Barbary War happened in 1815.
Second Carlist War happened in 1846.
Second Servile War happened in -104.
Second Sacred War happened in -449.