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.

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

c, they united with once