Why is the spanish civil war often called a “dress rehearsal” for ww2

The Spanish Civil War was a Civil War between the fascists and the communists in Spain.

As such, it was seen as a war between the two major rival ideological factions in Europe that would then go over to be settled by World War II.

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.

the fundamental orders of connecticut it would be the letter b