Final answer:
Gold was indeed discovered in California two weeks before the signing of the treaty that ended the Mexican War. James Marshall, a carpenter working for John Sutter, found flakes of gold at the mill house he was building on the American River.
Step-by-step explanation:
The statement is true. Two weeks before the signing of the treaty that ended the Mexican War, gold was discovered in California. James Marshall, a carpenter working for John Sutter, actually saw a few flakes of gold at the mill house he was building on the American River.