Why do you suppose the time period between 1919-1922 is sometimes referred to as a ‘return to normalcy’?

After the attacks of september 11, 2001, the united states demanded that

Did north or south korea forces advance further into the other’s territory?

Tim oxide reacts with the hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grains of sn