Answer:
Popular sovereignty, also called squatter sovereignty, in U.S. history, a controversial political doctrine according to which the people of federal territories should decide for themselves whether their territories would enter the Union as free or slave states.
Explanation:
The Kecksburg UFO incident occurred on December 9, 1965, at Kecksburg, Pennsylvania, United States in North America, when a fireball was reported by citizens of six U.S. states and Canada over Detroit, Michigan and Windsor, Canada
it´s not from google btw, I searched on bing
True. This is around the time WW1 started.
