Mass production of steel, large suspension bridges, steel frame construction in buildings. It allowed impurities to be removed cheaply and easily, enabling steel to be produced in mass quantities.
It would be commutative property because no matter how you put the situation the answer will not be different/ and or wont change
Manifest destiny. They believed it was their god given right to expand westward.
Answer:
a wide spread transfer of plants, animals, culture, human populations, technology, diseases, and ideas between the Americas and the Old World in the 15th and 16th centuries
