Answer: a computer company produces fewer laptops to meet tablet demand
Explanation:
One of the main causes was the rise of the Nazi party in Germany. Other considerable causes could be issues from past wars such as WW1. The effects were from the Cold War. There was a lot to break down. Some historians did tons of work to bring you and I this knowledge that's for sure.
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That would be the concept of zero, which the dates to around 1200AD in Europe. This doesn't mean it wasn't known in the Middle East and Asia. Evidence of the concept of zero in the Maya realm appears around 200BC-200AD.