what lasting effects did the battle of fredericksburg have?

Answer 1

For the men killed, wounded, missing, or made prisoner, the Battle of Fredericksburg had lasting effects.

From Wiki - - "The Union army suffered 12,653 casualties - - 1,284 killed, 9,600 wounded, 1,769 captured/missing.
The Confederate army lost 5,377 - - 608 killed, 4,116 wounded, 653 captured/missing."

I would like to say that neither army engaged in the stupidity of a frontal assault against a prepared defensive position after the day of December 13, 1862 - - but that was not true.
The South repeated the mistake with Pickett's Charge on July 3, 1863, and the North made a similar mistake at Cold Harbor in 1864.

Answer 2

SpreeDog got it right neither side learned from Burnsides stupidity.

When Joe Hooker replaced Burnside and planned the Battle of Chancellorsville he certainly kept the blunders of Fredericksburg in mind and tried to draw Lee off of Mayre Heights

Answer 3

Apart from adding Burnside's name to the list of failed commanders of the Army of the Potomac, Frederickburg had no lasting effects. Certainly it was a massive morale boost for the south and a disaster for the north at the time, but it had no long term effects. Lincoln was committed to subdue the south and the south was determined to resist.