有咩原因導致第一次世界大戰爆發??

極端民族主義
-盲目熱愛自己所處的團體，並經常對其他團體懷有惡意與仇恨。

殖民地競爭
-由於殖民地可以提供食物,原料(工業),海外市場,所以當時不同的國家都不斷去建立殖民地.
由於當時國家與國家之間都想要同一片的地方,於是他們之間發生衝突,繼而有戰爭的發生

盟約制度
-一個叫Bismarck的德國首相建立
-因為法國在franco-prussian war被德國擊敗,德國恐怕法國會聯同其他國家一起對付他.為此在1882年,他與奧匈帝國和義大利建立了一個軍事上的盟約,目的是為了令法國孤立
-法國要解除自己被孤立的形勢,於是與俄羅斯建立盟約.後來因為英國覺得德國的強大對他構成威脅,於是他加盟.

軍備競賽
-每個國家都為了準備打仗而不斷增加軍隊和海軍的數量,當時擁有軍隊最多的是德國和俄羅斯,而海軍則是德國和英國
-由於當時每個國家都準備了大量的軍隊和海軍,所以他們不害怕戰爭的發生,他們並不會以和平的方式解決
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例子:
極端民族主義-法國的報復,Pan-Germanism,Pan-Slavism
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第一次世界大戰爆發的原因應該是'Sarajevo Assassination
因為一個叫princip的人殺了奧匈帝國的繼承認人,於是奧匈帝國向塞爾維亞(Serbia)發動戰爭

2006-10-28 00:50:31 補充：
內容太長,未能盡錄,敬請原諒有d term我唔知佢ge中文,只好打英文

aliance system
2 parties were opposing each other. if one ally was in war with another, the other allies had to help them. this turned a local war into world war. (e.g. the austro-serbian war turned into WWI because of the support from other allies of them)

armaments race
although the countries were already allied, they felt unsafe. they started to build more armaments to protect themselves. as they had more armaments, they would easily fight with each other by use of the armaments. (e.g. britain and germany competed in building battleships/dreadnoughts)

colonial rivalries
both two countries wanted to colonize a certain country. they might fight for the land. (e.g. the moroccan crisis)

extreme nationalism
people in a particular country started to hate people in other countries. (e.g. france lost alsace-lorraine to germany in the franco-prussian war and wanted to start a war of revenge against germany to get back the land)

hope my answer can help you.
sorry for not answering in chinese 'cause i learn history in english and don't know how to say in chinese.