As a result of the union and confederate casualties during the battle of gettysburg,

Weakened Lee’s army for the rest of the war.

Explanation:

The Battle of Gettysburg is considered to be one of the bloodiest war in American history because of its enormous casualties on both sides. Confederate suffered about 28,063 casualties. With the Union defeating the Confederate led to serious damage for Lee's army and the South to gain independence.

the soviet union wanted to impose communist governments in eastern europe.