关于一些说英语国家的
Reasons for WWI:
The system of alliances Nationalism
Previous disputes Bad governments
Delays and misunderstandings in diplomatic communications The arms races of the previous decades. Old-style military planning Colonial rivalry Economic rivalry
Allies or Entente Powers
The British Empire France
Russian Empire
United States of America
The Central Powers
Austria-Hungary Bulgaria Germany
Ottoman Empire
Examples of new Weapons widely used in WWI
Machine Gun
Machine guns needed 4-6 men to work them and had to be on a flat surface. They had the fire-power of 100 guns.
Large field guns had a long range and could deliver devastating blows to the enemy but needed up to 12 men to work them. They fired shells which exploded on impact.
Tanks
Tanks were used for the first time in the First World War at the Battle of the Somme. They were developed to cope with the conditions on the Western Front. The first tank was called 'Little Willie' and needed a crew of 3. Its maximum speed was 3mph and it could not cross trenches.
The more modern tank was not developed until just before the end of the war. It could carry 10 men, had a revolving turret and could reach 4mph.
Planes
Planes were also used for the first time. At first they were used to deliver bombs and