It depends on what you take to be the beginning and what the end. It lasted two years if you understand it as from the time it was revealed to the time Nixon resigned. It lasted 5 years if you take it from the time Nixon began doing it to the time he resigned.
        
             
        
        
        
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James K. Polk was a strong believer in the Manifest Destiny. He expanded the borders of the United States all the way west. In only one presidency, James K. Polk gained control of the Oregon territory, New Mexico, California, and Texas.
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Answer:
The US supported tactics of repression which would lead to the deaths of 200,000 civilians, and which would rekindle stark ethnic, economic, social and political divisions in society – legacies of colonialism – which the 1944-54 governments had gone a significant way to repairing. The civil war which erupted as a result of American intervention stifled Guatemala’s economic growth, put an end to its political independence, and allowed a corrupt ruling class to dominate the country for its own political and economic gain. Furthermore, the Guatemalan. And all under the auspices of maintaining ‘freedom’ in the world. The US’s goal was to contain the spread of communism in Latin America, and in this it technically succeeded. But Guatemalans paid a high price.
 
        
             
        
        
        
The Provisional Government chose to keep Russian troops involved in WW1 after the Russian revolution (1917) because, having made promises to its allies in 1914, believed they should honor them. 
This resolution ultimately proved fatal. In June 1917, the Provisional Government ordered an attack on Austria, which failed. After that, people started to turn against the government. By the end of July 1917, the Provisional Government was almost powerless. 
 
        
                    
             
        
        
        
Before the arrival of Europeans, many North American populations used their environments as a means to survive. For example, many indigenous populations hunted animals, grew crops (like corn), and moved constantly in order to follow big game (such as buffalo). Regardless, many populations did not view land as something that can be possessed by one individual or group.  Rather, they saw land as something that all members of the community could use. 
This drastically changed with the arrival of Europeans. During this time, Europeans viewed land as something that individuals controlled. Along with this, land was viewed as extremely valuable due to the resources it could provide. These differing views of land caused significant problems between Europeans and indigenous people.