Why was the battle of gettysburg a significant moment during the civil war?

The battle of Gettysburg  brought victory to union and stopped Confederate invasion of the North under General Robert E. Lee.

Explanation:

The battle of Gettysburg played a significant role in the Civil War in America. The war fought in 1864 and thought to be one of the bloodiest battles in the American Civil War. The casualties reach above 50,000 during the three-day campaign. It was the South best chance to gain victory, but it gave a new life into the Union war effort. The battle won by the Union, which encourage them to stand their hold in the war, until its end.

the main reason the us senate rejected the treaty of versailles was because "european nations wanted to punish germany"

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yup! you are correct it is b.