What event is most associated with the beginning of WWI?

it was mostly accosiated with Hitler invading certain countries and putting Jews and people who are disabled in concentration camps

Explanation

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

(e) a major consequence of the election was that several southern states