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Two of the root causes of WW I were nationalism and imperialism. Theses were both issues that were being dealt with and that had started in the mid to late nineteenth century.
The Sarajevo Incident was the most important event in the twentieth century as this incident lead to the outbreak of WW1.
1929
Birsa Munda
World War II occurred in the twentieth century (1st September, 1939 - 2nd September, 1945).
What war was the result of militarism and nationalism in later nineteenth and early twenthieth centuries
20th century
In the nineteenth century.
militarism
Twentieth-century literature covers a broad range of subjects from diverse contributors.
nationalism developed into such a powerful sort of from the affect from accounting
2091 = twenty first century. 1991 = twentieth century. 1891 = nineteenth century. 1791 = eighteenth century. And so on.
Mirabeau Olympe De Gouge
Thomas Edison.
Thoreau
Conservatives and Liberals felt that nationalism was a treat and the disliked the fact that he was allowed.
Fred Stambrook has written: 'European nationalism in the nineteenth century' -- subject(s): History, Nationalism