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All submarines can sink. Some can return to the surface.
They got married
Servants, Sweepers, House cleaners.........
Europe was led into warld war1.
Mostly steel with some wood, brass, and cast iron.
More than half of the people in most big Americans cities were immigrants or children of immigrants.
In the early 1900s, some women worked in factories or as teachers (among many other things). Apex-Secretaries and managers
Many of the early submarines ran on diesel engines. These were used when on the surface for propulsion and power, as well as charging the batteries. When they submerged, they ran on electric power from the batteries.
Right after the stone age.XD jk they were invented some time in the early to mid 1900s and became national and nearly global in the late 1900s (right after the 1950s)
author of "you can take the boy out of the country but you cant take the country out of the boy"
There are pictures of the Apache tribe. Check the related links. Some were taken in the late 1800s and some in the early 1900s.