Answer:
B,C,and D and e
Explanation:
B: THis is what the cuban missile crisis was
C: This also happended
D: This an example because this was a standoff to see if the sovits were going to use the missles
E: America surronded cuba to stop more missles being delivred
Slavery was released between the 40 years.
I think the answer is C
Hope this helps
Answer:
D. It convinced American leaders that they would need to invest more heavily in scientific training and research.