The cold war originates in the emergence of USA and Soviet union as the two dominant powers and main victors of the ww2. The two nations had conflicting ideologies which they desired to spread into the world. as the ww2 closed, the two countries failed to agree on how they would treat countries that had fallen in the war such as Japan,German and several eastern Europe countries. Stalin's soviet union was aiming at expanding communism, and the USA had to contain it.
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Another cause of tension was that the Soviet Union was trying to spread communism. The U.S. was against communism and they took leadership of containment policy. The Containment policy was the U.S. approach to trying to prevent communism spreading.
Irrigation allowed crops to be grown further away.
Leif Eriksson actually discovered america, Half millennium before columbus
Assuming that this is referring to the same list of options that was posted before with this question, "a military coup" did not trigger Haiti's fight for independence since this never occurred.
