Answer:
Electricity and the light bulb. The electricity because thanks to the invention many people were able to communicate more and it was first used for so many other inventions on the way. The light bulb became VERY important and especially for everyday convenience since the invention around 1802..it is said that there's about 20 light bulb inventors (Thomas Edison was just credited). steam power and electricity as well.
PBecause once upon a time.........it was the POPE who controlled a large swath of power......like a KING, which included large territories.
But over the years, and power shifts later........the Pope became less and less important, and more or less became boxed in, within Vatican City.......his last seat of Power. When Italy became a Unified Country..............they had to arrange a special deal with the POPE that left him in charge of his little area........a King, of sorts, within the Kings Kingdom. So they declared his little Popedom.......seperate , and allowed him to keep his little seat of Power.
I’m sorry but what is the link???