Accurate timepieces.
to locate place and for time calculation
the Chinese invention that allowed soldiers to fight on horseback was The saddle and stirrups.
The invention of writing allowed people to communicate more broadly than had previously been done.
steel
Steam
The marine chronometer allowed longitude to be calculated and so fix a ships position on the high seas when combined with latitude sightings taken from the sun. Another vital invention was the magnetic compass.
The telephone is a great invention in the history of communciation. The invention of radio allowed information to be rapidly sent between continents.
The invention of the Personal Computer spread in the 1990s and allowed people easier access to news and information.
Barbed wire
The SEXTANT. This instrument will give the latitude of a ship. However, because of solar movements a CLOCK(Time piece) is needed to determine the longitude(meridian). So the two inventions are ; - The Sextant, and the Clock .
The invention of the aeroplane has allowed humans to obtain a higher level of understanding of our world.
The invention of the telephone allowed people who where not near each other to effectively communicate. That meant the telephone began the shrinking of the world. It allowed America to grow much easier.