Answer:
cast iron, steel, and glass, with which architects, with the help of engineers devised structures of or sizes bigger than before, of forms better than before, and fit to perform functions which were not possible before.
Explanation:
Arabia merchants conduct trade over bigger areas.
He patented the cotton gin which revolutionized the production of cotton removing seed later on cotton became America’s leading export
Answer:
B
Explanation:
After being officially proposed, either by Congress or a national convention of the states, a constitutional amendment must then be ratified by three-fourths (38 out of 50) of the states. ... Amendments ratified by the states under either procedure are indistinguishable and have equal validity as part of the Constitution.
