Answer:
no one knows for sure but most think it was caused by WW2. When WWII started the USA started sending supplies to the allied powers and making the economy boom. When the USA entered the war millions of men where sent to the UK and all the jobs and factories where filled and pumping out supplies and resources at full swing.
Answer:
The most direct way nationalism caused World War I was through the assassination of Archduke Franz Ferdinand, who was the heir to the throne of the Austro-Hungarian Empire. ... Thus, nationalist movements broke out across the Slavic territories. Among the most militant nationalists were the Serbs.
