Didn’t this put an end to the campus protests for the most part?
Even college students in the 1970s were smart enough to never again bring rocks to a gunfight! After a decade of litigation State AGs learned never allow the National Guard to get involved with “campus riots” / panty raids / ROTC building arson / etc. Also that was a lesson to the National Guard to be allow itself to be used by politicians in Race Riots.
Kent State was a “teachable moment” in US history.
“Didn’t this put an end to the campus protests for the most part?”
Yes. It also helped in large part for us to lose the war.
I think the protests were already dying down. The first draft lottery was held December 1, 1969, and that informed a large number of students (including Slick Willie) of the probability whether they might be drafted.
1968 was the worst year of all for protests (and assassinations), and things began to settle some after that year. Nixon took office January of 1969 and began to reduce the number of US ground troops eary in his first term.
The fewer who had any reason to fear the draft, the fewer the protests and demonstrations.
This event slowed things down enough that the 1960s were clearly ending, since the adventure of the 60s was wrapping up, I adventured some more, won my permanent draft deferment in mid 1971, and then enlisted in the Army a few months later.