Gravity Falls
United States
Nations Of The World
100

Pre-teen male Protagonist. 

Who is Dipper Pines.

100

The US capital.

What is Washington DC

100

Biggest country by area.

What is Russia.

200

Pre-teen female protagonist.

Who is Mabel Pines

200

Top-5 most populated city in the US and the state it is in.

What is New York City, NY; Los Angeles, CA; Chicago, IL; Houston, TX; Philadelphia, PA.

200

Smallest micronation by area.

What is Sealand.

300

Grumpy great-uncle.

Who is Grunkle Stan.

300

Capital of Connecticut. 

What is Concord.

300

The No. of countries in the world.

What is 195.

400

Nerdy great-uncle.

Who is Grunkle Ford.

400

The capital of Vermont.

What is Montpelier.

400

Oldest country.

What is San Marino.
500

Triangular main-antagonist based on the Eye Of Providence.

Who is Bill Cipher.

500

Name all the US territories in alphabetical order.

What is American Samoa, Bajo Nuevo Bank, Baker Island, Howland Island, Guam, Jarvis Island, Johnson Atoll, Kingman Reef, Midway Island, Navassa Island, Northern Mariana Islands, Palmyra Atoll, Puerto Rico, Serrannila Bank, US Virgin Island, Wake Island. 

500

The last remaining communist countries.

What is the People's Republic Of China, Democratic Peoples' Republic Of Korea, Socialist Republic Of Vietnam, Lao Peoples' Democratic Republic and the Republic Of Cuba.