USA HISTORY

Detailed explanation-1: -The steam engine turned the wheels of mechanized factory production. Its emergence freed manufacturers from the need to locate their factories on or near sources of water power. Large enterprises began to concentrate in rapidly growing industrial cities.

Detailed explanation-2: -Railroad Spike, 1869 Railroads were the basis of the nation’s industrial economy in the late 1800s, creating new markets, carrying billions of tons of freight to every corner of the country, and opening up the West for development.

Detailed explanation-3: -We began the 20th century with the infancy of airplanes, automobiles, and radio, when those inventions dazzled us with their novelty and wonder. We ended the 20th century with spaceships, computers, cell phones, and the wireless Internet all being technologies we can take for granted.

Detailed explanation-4: -The invention of interchangeable parts allowed factories to create clocks like this one in mass quantities. At first, these new factories were financed by business partnerships, where several individuals invested in the factory and paid for business expenses like advertising and product distribution.