Henry Ford's invention of the Assembly Line probably fits this question. It allowed Mass Production automobile thus dropping the costs greatly.
Eli Whitney. Slavery increased because cotton production greatly increased after the cotton gin was invented.
yes
The Suez Canal, a man-made waterway in Egypt, greatly increased trade for Britain in India.
The steamship
The astrolabe and the compass.
The automobile has had a massive impact on modern day society. The automobile has greatly improved transportation from one area to the next.
Petroleum (oil) was first discovered in North Dakota in 1951 and greatly increased North Dakota's wealth.
After the war, the power of the federal government did greatly increase.
cotton gin
The steamship
Cotton gin
railroads