The 4 main ones are <span>France, Germany, Great Britain, and Portugal. Together they controlled most of Africa. Hope this helps
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Poland is one of the states that was trapped behind the iron curtain
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It allowed exchange of goods and travel between Upper and Lower Egypt, and was a trade route that allowed trade between other regions as well. Travel by boat was quicker than by land, so it was easier and faster to trade with regions further away and much more efficient. Additionally, Pharaohs expanded their empire along the Nile. The Nile was very important in expanding trading opportunities.
Coal and wood are two sources which had been used extensively since the 18th century. when steel was commercialized heavily using the Bessemer Proces later at the 19th century. At this time, petroleum became the major energy source of energy and was even used extensilvely in other processes as converting petroleum to fuels.