Answer:
Neap Tide
Explanation:
A neap tide occurs when the Moon and the Sun are in quadrature. This condition is the time at which the line from the Earth to the Moon is at right angles to the line from the Earth to the Sun. Thus, the tide-producing effects of the Sun and the Moon cancel each other.
Medival European history begins after the fall of the western Roman empire
I'm pretty sure it's navigation acts
The Red Scare which was basically another Cold War threat although it never fully escalated.
