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2.
Glacier National Park, Yosemite National Park, Yellowstone National Park, Crater Lake National Park
3.
(Discovery-wise) Brass, Copper, Tin, Coal
4.
Industrial Revolution, Civil War, Antebellum Period, French Revolution
5.
Moths, Frogs, Ticks, Lancelets
6.
(Formation-wise) Ottoman Empire, Persian Empire, Roman Empire, Seljuk Empire
7.
Call of Duty, The Joy of Creation, Grand Theft Auto V
I'm getting kinda lazy Uwu
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8.
Samsung S8, Apple 12, iPhone X, Galaxy S6
10.
(Most Guessed in Countries of the World Quiz by Quizmaster) Turkey, Portugal, Finland, Iran