<span>The Charter of the United Nations was signed on 26 June 1945, in San Francisco, at the conclusion of the United Nations Conference on International Organization, and came into force on 24 October 1945.</span>
The answer to your question would have to be the discovery of coal
Ol·i·gar·chy
<span><span>ˈäləˌɡärkē
/</span><span>noun
<span /><span>a small group of people having control of a country, organization, or institution
</span>Therefore, C.
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A government system is an example of a cultural region.
He was probably tired and getting old. He decided not to be elected again for a third term and this suggests that two terms were enough for any president. This became the unwritten rule for all presidents until 1940.