How was pearl harbor a turning point for the course of the war and oppenheimer?

The bombing of Pearl Harbor got us into WWII against Japan, Germany, and Italy.
And Oppenheimer was the lead Nuclear Scientist behind the development of the Atomic Bomb which we used on Japan in 1945 to end the war.

“in fact, mississippi was the only state to reject the amendment. the 24th amendment also gave congress power to enforce it. a year and a half later on august 6, 1965, the voting rights act was enacted and banned poll taxes in all u.s. elections.”