What was the purpose of the national alliance such as the triple alliance and the triple entente?

Why were the Japanese fearful of a strong China before world war 2? What role did noor ud din zangi played in crusades? How are the major early civilization similar describe three ways in which they where similar? What was the worlds first oil producing country? How many jeffery's are in the world? Which Australian city acted as a capital until 1927? Why was the reason for World War 1? What where the sizes of the other two floppy disk? What were the most important alliances of World War I? What was one effect the end of the international slave trade? By the end of the Revolutionwas Britain actually fighting a world war? What countries were involved with crisis in the Balkans that started World War 1? Tensions in Europe before world war 1 were most increased by what? Which European nations were first to explore and conquer other parts of the world? What Name was given to the cart for guillotine? What three important event happened in the 20th century? Which European power did the Half-King choose to support? What did Georges clemenceau want to achieve? What where living conditions like in the Elizabethan era? What was at stake in World War 1?