Why is the Union victory at the Battle of Gettysburg considered the turning point of the Civil War?

Aside from low birthrates and high death rates, what can cause a country’s population to decline

This photo shows an early mesoamerican structure, specifically from the zapotec culture. what was this structure most likely used for? a. creating terraces for farm fieldsb. practicing religious ceremoniesc. playing a ball game with stone hoopsd. protecting a city from invading armies

He table below shows the number of immigrants to the united states from different regions of europe between 1871 and 1910