3. World War I involved 2 major alliances-the Allied Powers and the Central Powers. Below, list the major European countries that belonged to each alliance.

Allied Powers were Britain, France, Russia, Romania, Serbia, Belgium, Montenegro, Greece, Portugal.

Central Powers were Germany and Austria Hungary, who were later supported by Bulgaria and Ottoman Empire.

Italy was a member of Central Powers, but after the treaty of London in 1915 changed sides, and supported the Allies.

Explanation:

War began on July 28, 1914 when Austria Hungary declared war on Serbia. Many countries interfered and supported one or other side.

Allied Powers had more support not only in Europe, but even some countries on the other continents supported its causes.

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.