The Seneca Falls Declaration:)
Answer:
Gypsum
Explanation:
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO. 2H2O. It's used in many forms of plaster, blackboard/sidewalk chalk, and drywall :)
Unrestricted submarine warfare
Germany used this and the Zimmermann Telegram to eventually draw the United States into the war. The Zimmermann Telegram was a secret diplomatic communication that said Germany and Mexico were in an alliance. Unrestricted submarine warfare is where submarines would sink vessels without warning, instead of following the cruiser rules.
