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One reason : Machines were too difficult for workers to use.
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By finding ways to make them self dependent and familiar with modern developments.
The invention and creation of the telegraph made a faster and cheaper method to send information across the nation, The Pony Express ended because of an advance in technology.
We needed to know this why??i am very confused my g where is the question
Answer: Nixon and Soviet General Secretary Leonid Brezhnev signed the ABM Treaty and interim SALT agreement on May 26, 1972, in Moscow. For the first time during the Cold War, the United States and Soviet Union had agreed to limit the number of nuclear missiles in their arsenals.