Answer:
In the 1800's. If you wanna be really specific, it's the late 1790's.
The collapse of the Indus Valley Civilizations can be attributed to the following factors. One, the trade networks declined and disappeared. This meant less work for traders and manufacturers. Two, changes in geography that caused the rivers to either dry up or change direction Three, the people abandoned the major cities. Four, without trade and access to water, people succumbed to disease and starvation.
Answer:
They had practical inventions, like locks and keys, paved roads, use of iron, plumbing, flushing toilets, and the sexagesimal clock (the beginnings of the way we tell time today). The Assyrians also brought about the use of the first guitar, first libraries, first magnifying glass, and the first postal system.
Explanation:
