The Missouri Compromise
Missouri was admitted to the Union as a slave state & this New England state as a non-slave addition
Maine
A tropical reef dweller that has striking markings that make sure to confuse predators, similar to that of an insect
Butterfly Fish
In 1796, to fight smallpox, Edward Jenner successfully used these, from the Latin for "cow"
Vaccines
Has the most members in the U.S. House of Representatives, with 53 in the 117th Congress
California
Harry Shearer voices both Mr. Burns & this devoted executive assistant
Smithers
The procedural wizardry of this longtime congressman from Kentucky got the compromise passed
Henry Clay
Meerkats aren't felines, they're in the family named for these cobra fighters
Mongeese
In 1620 Spanish priest Juan Pablo Bonet published the first book about this type of communication for the deaf
Sign Language
Has the Sitka spruce as its official state tree
Alaska
Shrek says of this sidekick's ability to talk, "Yeah, it's getting him to shut up that's the trick!"
Donkey
The 1820 compromise allowed slavery only south of a line of this; it still forms state boundaries & there's a marker on it in Enid, Oklahoma
Latitude,
Mason Dixon Line
A rare pink species of this land reptile lives around a volcano on Isabela Island in the Galápagos, and their name begins with the first name of the island
An iguana
Operation Big Switch, involving the exchange of thousands of these people, was a key to the agreement ending the Korean War
Prisoners of War
Has a postal abbreviation consisting of 2 vowels
Iowa
In 1954 DC Comics debuted a series about "Superman's Pal", this copy boy-turned-cub reporter
Jimmy Olsen
Many anti-Missouri men had been active in this faded party & were accused by opponents of using the issue to make a comeback
The Federalists
With ridged horns, the kob of Africa is a species of these swift ruminants
Antelopes
This structure fell on November 9, 1989, symbolically bringing an end to the political division between East & West
The Berlin Wall
Was where Diana Nyad completed her historic 53-hour effort in 2013
Florida
Peter Mayhew played this hairy sidekick to a pilot who made the Kessel Run in less than 12 parsecs
Chewbacca
The compromise was repealed in 1854 by this act with a hyphenated 2-state name, spurring Abe Lincoln's return to politics
Kansas-Nebraska Act
One of the strongest kinds of beetles, this type seen here bears the name of a large herbivore and the resemblance of a much larger one with a horn too
Rhinoceros Beetle
A fundamental shift in government policy starting in 1990 led to the end of this policy of discrimination in South Africa
Apartheid
Was the birthplace of Ronald Reagan & was the site of Ray Kroc's first McDonald's franchise
Illinois
This doctor is a partner to Sir Arthur Conan Doyle's most famous character, who resides at 221b Baker Street
Dr. John Watson