The 16th president, known for his Gettysburg Address

This element is commonly used in swimming pools to help eliminate bacteria and algae

Colonial opposition to British attempts of control

First introduced on January 18, 2018, this location was struck by a meteor, creating a huge crater in the center of the city

This is the second step according to PEMDAS

This president is known for his purchase of the Louisiana territory

This element with atomic number 1is the lightest of all elements

Disputes over the Ohio River Valley

The oldest point of interest, this location has been around since launch

This is used to describe the value of a function

The 13th president, known for his insistence on federal enforcement of the Fugitive Slave Act of 1850

This element is known for its use in bipolar disease treatment with the atomic number 3

The explosion of the U.S.S. Maine

This location is the smallest point of interest to date

This greek symbol translates to "the sum of"

The second president to be murdered in office was fatally shot in a Washington railroad station

The atomic symbol of this element spells out a word used in giving a negative response

The assassination of Archduke Franz Ferdinand

This location was located at the top of a snowy cliff

This term is used to describe when a number is multiplied by every whole number below it and is shown with the symbol "!"

The 23rd president, who shares the last name of the first president to die in office

This element helps the body form connective tissue, bones, blood-clotting factors, and sex hormones with an atomic number of 25

Revolt from the Greek Ionians after mass silver mining

This location was frozen over by an iceberg in season 7

This term describes the difference between the exact point from the predicted value of an LSRL