The correct answer is the following.
The significant threats to water quality in the United States are industrial pollution, sewage pollution, and water from the sea that is salty.
The Earth is mostly composed of water. But the problem for humans is that most water contains salt. Only 3% of the planet's water is fresh and for humans to drink. That is why the topic of water pollution should concern everyone on the planet. There are many pollution contributors on a daily basis such as fertilizers, pesticides, solvents, and spilled chemicals
President Polk wanted California but knew Mexico would not agree to sell it and his only avenue was to start a war (knowing the US would win it).
