The ability to smelt metal led to the cultural innovation of being able to create powerful weapons out of things like iron in early civilizations around the world, which greatly increased the violence of warfare and conquest.
Answer:
Massive Cannons.
Explanation:
I think that one is your best best, but I am not 100% sure soo...take this answer with a grain of salt.
Answer:
The blockade of Texan ports damaged imports and exports, slavery was abolished so East Texan cotton production plumeted, and finally, in order to fill in the gap, cattle production increased.
The German U-boats blocked British Isle and attacked merchant ships affecting the trading business of US with British, but at some stage the U-boats started to attack ships taking the lives of unarmed passengers, as with the Lusitania ship, which 120 American died. The Germans were asked to stop the attacks but they did not and many US ships sank, shedding off US citizens lives. The submarine warfare enraged the US neutrality which then turned against the German and declared war on March 1 in 1917.
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