Answer:
The Triple Alliance and Triple Entente were formed through the signing of treaties.
Step-by-step explanation:
-The Triple Alliance consisted of Germany, Austria-Hungary and Italy.
(formed in 1882)
-Initially was formed with the goal to protest and increase the co-operation against the threat to Germany.
-Triple Entente was France, Great Britain and Russia (formed in 1907) Serbia also joined the Entente.
-It was formed due to the fear of Russia seeing the increasing growth of armies in Germany and the Triple Alliance.