What about them being rare?
Early English translation
Answer: Institutional Revolutionary Party (PRI), Spanish Partido Revolucionario Institucional, Mexican political party that dominated the country’s political institutions from its founding in 1929 until the end of the 20th century. Virtually all important figures in Mexican national and local politics belonged to the party, because the nomination of its candidate to a public office was almost always tantamount to election. Originally called the National Revolutionary Party (Partido Revolucionario Nacional), the party was renamed the Mexican Revolutionary Party (Partido de la Revolución Mexicana) in 1938 and took its current name, Institutional Revolutionary Party (Partido Revolucionario Institucional; PRI), in 1946.
Explanation:
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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