an "E"
What is an eclipse
Oxford says this preposition is the 7th-most common word in English; it's in this clue twice
"In"
In America:
1754 to 1763; prior to the revolutionary war.
French and Indian War
5 Letter word meaning to make very happy
Elate
Because of metal shortages, from 1943 to 1945 these famous award statuettes were made of plaster
Oscars
It ended in 1945 after the treaty of Versai
World War II
It means to free a slave from bondage
Emancipate
The traditional "Big 3" of U.S. automakers are Chrysler, General Motors & this one
1618 to 1648:
(Hint use math!!)
The 30 years war
The art of using language with fluency & aptness
Eloquence
This state's richest man is French fry tycoon Scott Simplot
Rather than going to nuclear war; it instead became this
The Cold War