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Stockpiles of strategic nuclear weapons began to decline in the United States in "<span>d. the mid-1990s," due to the fact that this was when the Cold War really began to come to a close. </span>
There was much more civil unrest during the 1960s than the 1950s. However, unrest in both decades was caused by the issues of African American rights and grievances. In the 1960s, but not the 1950s, unrest was also caused by the Vietnam War. In the 1950s, there was little civil unrest in the US.
A historian would use a calendar when he is trying to find the dates of when the event occurred, such as the dates of a battle, natural disaster, or how long a type of government has ruled.
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