Question

after peace talks between the united states and north vietnam stalled, which occurred first?
the united states bombed north vietnam.
communist forces invaded south vietnam.
us bombers attacked the ho chi minh trail.
us forces mined north vietnamese harbors.

Explanation:

After peace - talks stalled, the US first bombed North Vietnam. Other events followed later in the context of the Vietnam War.

Answer:

The United States bombed North Vietnam.