The use of radar and sonar helped the Allies to win World War II by helping them to - anticipate the moves of their enemies

break German and Japanese secret codes

manufacture more aircraft and tanks

win popular support in Axis-occupied territories

the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.

the correct answwer is d

b. introduce the core ideas of the new government.