Which event happened before general lee moved his forces out of pennsylvania in 1863?

The Battle of Gettysburg took place around the town with the same name in 1863 in Pennsylvania, as part of the American Civil War. It became the most costly battle in US history with large number of casualties in both sides. Union forces were leaded by George Meade who could defeat the attacks initiated by the Confederates under the command of General Lee.

After the defeat at Gettysburg, Lee's army retreated to Virginia.

here are some major conflicts i found. maybe pick one and do more research on it. (cause i ain't writing 6 paragraphs)

in 1877, the nez perce war took place.

1881 - president james garfield was assassinated.

1882 - the chinese exclusion act was passed.

1883 - a decision in the civil rights cases legalized racial segregation in the united states.

1887 - the dawes act was passed.

1893 - the panic of 1893 took place. (what a creative name)

and there are probably other topics you can find if you just search up "united states timeline," or "conflicts in the 19th century for america."

then once you find a topic you like find out how it affected the people of america and what not. (sorry if this feels a bit short changed, history was and never will be one of my strong topics)