Which city became the steel and iron
capital of the U. S. by 1900?

Pittsburgh

Explanation:In 1900 the value of manufactured products in Pittsburgh was more than Cleveland and Detroit combined. How did Pittsburgh become the steel capital of the world? First there was iron. Pig iron is the product of the smelting process: the reduction of iron ore in a blast furnace.

i think it is the byzantine empire

- 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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