The North knew the US was re-deploying.
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Increased involvement in the war
Escalation
With the massive build up of men, from 1965 onward, 500,000 men at the peak of the war.
escalation. Keep Calm and Carry On, good PLATO friend.
Militarism, alliances, Imperialism, and nationalism European countries entered into military alliances that required them to protect one another from attacks. This led to escalation as more countries were drawn into the war.