This was an attempt by the Allies to create a western front on continental Europe that ended in disaster. At the time, it was the largest amphibious invasion ever. The bloodbath that was Dieppe was crucial to the ultimate success of the Allies. Without the lessons learned at Dieppe, the Allies never would have been able to orchestrate D-Day successfully.
Following the failure of Dieppe, the Allies came back with Operation Torch. The issue of creating a second front to ease the stress on the Soviets was even more pressing. Operation Torch succeeded in diverting some of the Axis attention away from the eastern front and the Red Army. Another factor in play was that the Allies wanted to weaken the Axis powers away from their center of power, before striking closer to home.
D-Day provided the Allies a foothold from which they could invade the rest of continental Europe. D-Day was absolutely critical in terms of Ally victory. It is the largest amphibious invasion to date. It signaled the full shift in control of the war from the Nazi’s to the Allies. The momentum gained from D-Day paved the way for Allied victory soon after.
The Liberation of Paris signified the beginning of the revival of Europe, with the return of its shining beacon to the Parisians and Europeans alike. If D-Day was the turning point towards Allied victory, then the Liberation of Paris was a large step along the way.
30AU not only helped with some of the major fighting in Germany, but chiefly, they rounded up many of the high level Nazis within German society. They were responsible for collecting the scientists, bankers, and executives within the actual government.
The bombings in Hiroshima and Nagasaki caused the Japanese to surrender almost immediately; but more than that, the bombs decimated the Japanese cities upon which they were dropped. They ushered in an era of nuclear warfare, or more the threat of nuclear warfare which has played a significant role in modern world history to date.