The reason why many historians regard the printing press as the most important invention of the past millennium is because it allowed for thoughts and ideas--and thus things like revolutions and large-scale changes--to spread far more quickly and effectively.
The main reason why the United States involved itself in a civil dispute on the Korean peninsula in the 1950s was "<span>to exercise the policy of containment," since they were attempting to stop the spread of communism. </span>
