Alliances
There were approximately 2 large groups in the War. One of them were known as the ' Triple Entente', and the other group was known as the 'Central Powers'. But who had the alliance with another country to perform a group? Well, at the start of the war, Britain didn't want to be left out, so they had an alliance with France and Russia, and that's how you got group number 1, the Triple Entente. On the other hand, Germany wanted to join with Austria and Hungary, so they had an alliance, and now they were known as the Central Powers.