What was happening during Maria Montessori's time?

Dr. Maria Tecla Artemesia Montessori, or simply Dr. Maria Montessori, was born on August 31st of 1870 and died on May 6th of 1952.

As far as I know, during her time, the following events occured:

World War I, which started from 1914 through 1918; The Great Depression, 1929 to 1941; World War II, 1941 to 1945.