When did world war two begin and why?

World War II began in 1939.  It began because of Germany invading Poland. Poland's allies fought back, and because of that, Germany's allies fought against them.  This is what happens when allies are made to help defend other countries, it makes the whole world go to war.

1939 , it happened because of Germany invading Poland .

Upheld the 1st amendment according to the u.s constitution. freedom of speech being limited in this case yes national emergencies