Because some societies were more complex than others and so they required writing and also they could support specialist scribes.
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because resources are valuable
They have made conflicts (wars) between major powers such as the US and Russia very unlikely. The cycle of major wars that plagued Europe for centuries has also stopped. Hopefully this will continue, but conflicts over dwindling natural resources may eventually arise.
The Kuwait dinar is the highest valued currency in the world. As of Feb. 3, 2011 one Kuwait dinar was worth $3.57 American dollars. I do not know if that makes it the strongest. The Australian dollar and the Canadian dollar are currently valued at $1.01. Both currencies are considered strong because the countries have very low national debts. The countries also have very productive precious metal mines, which could enable those countries to quickly shift to gold or silver supported currencies, should a worldwide monetary crisis arise.
Both the French and British wanted to control the lands west of the Appalachian mountians. They were extremely competitive over powerand wealt due to the fact that they were two of the strongest powers in Europe. But this was only the start. Afterthe British took the Ohio River Valley, bitterness increased because France did not want to share to share the rich fur trade.
Well, honey, the eyewitnesses to Thomas Becket's murder were the poor souls who had to witness four knights barging into Canterbury Cathedral and hacking away at him like a pinata. It was a bloody mess, let me tell you. But hey, at least they had a front-row seat to history, right?