Answer:
World War 1.
Step-by-step explanation:
The excerpt "Poise has been disturbed, and nerves have been racked . . ." have been taken from President Warren G Harding's presidential campaign speech "Return To Normalcy" of 1920.
This excerpt refers to the global catastrophic events afflicted by the First Word War between 1918 to 1920. Harding wants to assure the citizens of the country that it was time to renew and heal the country from the remnants of the war. Thus, calling the people to return to normalcy and peace.