President FDR's New Deal prepared America for WWII after the Pearl Harbor attack. In 1930's the US government had strong a strong isolation moventent and isolantist thought the wars in Europe should stay in Europe, and President FDR knew that was not possible so he started the Lend Lease Deal. His Lend Lease Deal with Britian and the Soviet Union helped in giving America ideas on how much power they had. The Lend Lease Deal was that America will loan Britian their guns and ships to attack Germany during the war and when the war is finished they have to return it in a kind matter. The Britian prime minister asked FDR if your nt going to fight in the war can we borrow your guns and ships to fight, and thats when the Lend Lease Deal was put to use. The U.S. had been producing many weapons, and ships, tanks and airplanes to be prepared for war before the bombing of Pearl Harbor, but sense they where not directly in war with anyone they lent their supplies to their allies. These actions where not successful because when Hitler declared war on the U.S., and Japan attacked they didnt have as much supplies as the should have to sustain the war that had lasted them for the next 2 years. America was building up the governments industrial capability so it could help them in producing guns but only for helping their allies to help fight in the war.
President Franklin Roosevelt signed the declaration of war against Japan one day after the unanticipated attack on Pearl Harbor. The government spending on military expansion surged significantly at the cost of domestic programs. It is estimated that the military budgetary allocation shot from 500 million dollars to 26 billion dollars between 1939 and 1941. The Naval Expansion Act of 1940 facilitated military reinforcement by authorizing the building of more battleships and air crafts among others. There was also vigorous recruitment of soldiers into the military and it is estimated that in the summer of 1942, the number of soldiers was at 1.5 million compared to the 8 million figures indicated by the end of the war in 1945. In addition to that, the government encouraged females to join the military for various posts in support of the war which they did successfully.
The government encouraged the public to support the war through the introduction of War Bonds that generated funds which helped meet the rising military needs of that time. Despite the fact that the war had negative implications such as the loss of many lives, the efforts above were successful because they enabled America maintain a strong battle front against the opposing Allies who eventually surrendered unconditionally bringing an end to the Second World War.
Clearly the actions taken by the US government after Pearl Harbor were eventually effective. The government intensified the drafting of men into the military. It instituted things like rationing to make sure that there would be enough in the way of resources for the military to have all the weapons and other supplies that it needed. The government's actions were clearly successful in the long run. We can say this because the US won the war. Of course, this does not mean that the government's actions were 100% efficient or that they were the best possible actions to take. All it tells us is that the actions the government took were sufficient to win the war.
I think that there was some progress in mobilizing everyone in the time that they had, but it was a surprise attack. There was still a lot of damage done. There is only so much you can do if you do not know in advance.