The main causes of the first world war were:
<h3>Militarism</h3>
There was a growth of millenarianism in nations. many nations had sophisticate weapons and well trained military.
<h3>Alliances</h3>
The alliances that were formed between nations was part of the war. There were the axis and the allied powers.
<h3>Nationalism</h3>
The increase in nationalism and the need to protect country and property was a part of the war.
<h3>Imperialism</h3>
Some nations has powers over other countries. They controlled the affairs and the resources in these areas.
<h3>Death </h3>
The killing of Franz Ferdinand was partly the reason why the war started.
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Wine and all other intoxicating beverages is haram in this world because it is toxic (intoxicant) made from fermented foodstuffs. However the liquor mentioned in the quran is not the same.
Increase of nationalism and capitalism and militarism increased competition