Do not drink mercury .
Walls are effective .
Guns are better than swords. Fireworks are cool , and can be made into bombs .
A president is better than a royal family .
Torpedoes.
Rockets = Air/Land combat
Torpedoes = Naval combat
AR15s = Soldier/personal defence
Pistols = Soldier/personal defence
This is because it was when the Allies were able to defeat the Axis powers, which gave hope to the Allies to fight stronger. Also, when they defeated Axis powers at that battle, they(ALLIES), now had vantage points on both sides of Germany; east(UK) and west (Russia).
They contributed to World War 1 through the assassination of Archduke Franz Ferdinand. The Black Hand was part of a Pan-Slavist movement in which they wanted to unite territories of South Slave that had been annexed by Austria-Hungry. Hopefully this helps.
Answer: Same I can;t type too
Explanation: