Why did the confederate army lose at petersburg Virginia?

The Confederate Army lost at Petersburg, Virginia, primarily due to a combination of strategic overextension, dwindling resources, and effective Union tactics. General Ulysses S. Grant's forces laid siege to Petersburg, cutting off supplies and reinforcements, which weakened the Confederate defense led by General Robert E. Lee. Additionally, the Union's superior numbers and the use of trench warfare ultimately wore down the Confederate positions. By April 1865, the fall of Petersburg directly led to the collapse of the Confederate capital in Richmond and the eventual surrender of Lee's army.