What factors contributed to the stalemate? Check all that apply.Both sides had very low casualty rates.Neither side could seize significant territory.Both sides dug trenches that were heavily fortified.Both sides had effective offensive weapons.Both sides had invasion plans that proved to be successful.

The stalemate developed because neither side could gain significant territory, even after repeated attacks. Both sides built heavily fortified trenches, making it difficult to break through enemy defenses. Casualties were high, and offensive weapons and invasion plans did not let either side achieve a decisive victory.

AI-written and checked against the verified answer.