True, the fertile soil of the Tigris and Euphrates Valley was a resource that drew people to this area. In addition the plenty supply of water allowed for easy access to water and irrigation.
Answer:
The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons
Explanation:
Hmm, there were several triggering events that promoted westward expansion of the United States. Victory in war over Mexico (1848) gave the US new lands in the west. A treaty with Britain (also in 1848) gave the US sole possession of some formerly disputed Oregon territory lands also. Plus, in 1848, gold was discovered in California (land newly in US possession after that Mexican war treaty), so that prodded westward expansion too. Perhaps those are the initial "turning points" you're looking for. The completion of the Transcontinental Railroad in 1869 sure helped the process as it was underway, as well.
Answer: Failure to reach agreement on the conduct of free democratic elections by the USSR, which resulted in gradual withdrawal, increased tensions and finally the Cold War
Explanation: Before the end of WWII when the final victory of the Allies was already evident, the United States and the Soviet Union had some agreements, one of which was the conduct of free democratic elections in all the countries of Europe. As Eastern Europe according to these agreements belonged to the Soviet Interest Zone, the USSR was supposed to carry out the mentioned democratic elections in Eastern Europe. The Soviets did not respect it, guided by the idea of the World Communist Revolution, and imposed communism in Eastern European countries. On the other hand, the Western Allies were afraid of the spread of Communism and they wanted to prevent this. One of the things that has been done on this issue is the formation of the Western European Military Alliance of NATO, along with the Americans. In response, the Soviet Union formed the Warsaw Pact of the Eastern European Satellite States, and thus formed two opposing blocs. As the leaders of these two blocs, two super powers have been singled out, the USSR and the US, of course with their allies, and the relationship that has emerged between them is known as the Cold War period. The Cold War was the proof of world-class assets, political, military, economic. There were no direct military conflicts, but the financial and military support of other smaller states that were at war, so called proxy wars. It was also evident that there was an arms race, then a space race, as well as constant propaganda against the others and the maintenance of constant tension.