If electricity hadn't been invented in the late 19th century, ...
?
If paper hadn't been invented in the 2nd century, ...
?
If vaccination hadn't been invented in 1796,
...
If the Internet hadn't been invented in 1960s,
...
If the fridge hadn't been invented in 1850s,
...
If the airplane hadn't been invented in 1903,
...
If the PC hadn't been invented in 1970s,
...
If the telephone hadn't been invented in 1876,
...
If photography hadn't been invented in the early 19th century,
...
If air-conditioner hadn't been invented in 1902,
...
