Select the two conflicts that led to progress and industrial power

The correct answer to this open question is the following.

The two conflicts that led to progress and industrial power were wars. Yes, the War of 1812 and the American Civil War.

We condemn war, but it has been to the new inventions on the battlefield that progress has reached the industry and has benefited society. New machines and technology used in the war, later was used or adapted to improve the manufacturing processes in the factories of the United States.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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b) race riots in several cities