How did the Union's feelings about the war change after the Battle of Bull Run?

Question 1 options:

They were more confident that they would win.

They realized that the war would not be easily won.

They wanted to surrender to the south.

They wanted to end the war and keep slavery in place.

The Union's feelings about the war change after the Battle of Bull Run was that t hey realized that the war would not be easily won. The First Battle of Bull Run shattered the Union's hope of winning the war quickly and easily. The North learned that t he Union went into the Civil War with the idea that it would be easy to defeat the South.