US has been formed by joining of the states
The likely effect of such trail lines that were left by pioneers migrating to the west were that people who moved there afterrwards were able to derive information regarding where it was relatively safe and where territory has been charted and mapped before. This enabled a little certainty in areas of great danger.
Development of agriculture was a turning point in the development of humans. This was because with crops there was less need to hunt. This gave more time to develop society. <span />
Angola's civil war happened at the time of the Cold War, when the US and Soviet Union fought a number of proxy wars. Angola's war was simialar to those and one of the sides was Marxist-Leninist, so the Soviet Union was bound to support it and the US oppose it.
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The Berlin Conference of 1884, which regulated European colonization and trade in Africa, is usually referred to as the starting point of the Scramble for Africa. There were considerable political and economic rivalries among the European empires in the last quarter of the 19th century.
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