It is believed they invented the sailboat, the chariot, the wheel, and the plow.
It is for certain they invented cuneiform (the first written language). They also invented checkers (the game)...lol.
D before the Crusades trade was literally nonexistent between them and after it brought new technology and products such as silk and food etc.
Europeans couldn't travel into the interior of Africa in order to take it over because of the African-ruled trade, couldn't navigate violent rivers, or overpower their strong armies. Disease also held them back.
Answer:
A prolonged war and greatly increased the number of casualties in the war
Explanation:
In World War I we saw the introduction of chemical weapons, machine guns, artillery, and tanks. All of this resulted in trench warfare and the lack of tactics to fight the new weapons meant that the war would be longer and a lot deadlier than it would have been without those weapons. It dragged for years from one stalemate to another and claimed a lot of lives.
