Why was the st valentine's day massacre important? And why are students studying this case?

Saint Valentine's Day Massacre, (Feb. 14, 1929), mass murder of a group of unarmed bootlegging gang members in Chicago. The bloody incident dramatized the intense rivalry for control of the illegal liquor traffic during the Prohibition Era in the United States.

hope it help u make me brainlist o

the total distance traveled by the car is

30km + 49km = 79 km .

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge