THE WORLD WAR I.
During the World War I there were importants powers.
The Central Powers: Empire and Astro-Hungarian Empire.
The Powers: British Empire, Republich and Russian Empire.
The war expanded to territories outside of .
United States joined the war in and Russia abandoned the war because of the communist revolution in this year, too.
There were important advances in weapons included , rifles and more powerful machine guns, shells and granades.
Britain used tanks in .
The soldiers lived in tunnels called as protection and morse code was used to send messages to the soldiers.