The 1970 invasion of Cambodia came as a surprise for two reasons. First, Nixon did not declare war on Cambodia so he didn't ask permission from Congress. He simply made it a part of the larger Vietnam War campaign. Second, it came at a time when Nixon was talking about slowly scaling back U.S. involvement in Vietnam and many saw this as doing just the opposite by widening the scope of the war.
Because it looked like the war was now expanding into other countries and would soon go nuclear if someone didn't stop it.
the invasion of cambodia
Richard Nixon announcing an invasion of Cambodia in 1970 surprised many people because he had promised to end the war in Vietnam. His campaign called for an end to the war.
1970
On April 1970 Nixon authorized the invasion of Cambodia to pursue North Vietnamese troops
The invasion of cambodia
Crossed the Cambodian border (Into Cambodia) on 01 May 1970; stayed sixty days, penetrated 21 miles.
They were restricted after Nixon's invasion of Cambodia in 1970.
President Nixon ordered US Ground Troops into Cambodia on the morning of 01 May 1970. Most of us were out and back into South Vietnam by June 1970.
This announcement came as a surprise because this did not look like "vietnamization". They thought Nixon was trying to "win" the war with more American troops and a new battleground. They believed the US should not be invading a new country and widening the war.
announcement of invasion of cambodia
Kent State University