What made WWI so brutal?

Poison gas, machine guns, artillery bombardment, submarines air planes etc. were weapons of war that caused enormous damage. Some of them - e.g. artillery existed - long time but modern technologies made it much more destructive. Paradoxically the level of technology was also lacking in some ways.  

Explanation: Can you make me Brainlest if i get right?

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.

b. the american revolution