Why did the builders think that the Titanic was unsinkable? The ship was the lightest ship ever made.
It had 16 decks that each acted as its own lifeboat.
There were 16 watertight compartments and a double bottom.
They had figured out how to make the ship out of buoyant materials

There were 16 watertight compartments and a double bottom.

Explanation:

The builders of the Titanic ship believed the ship was unsinkable because of the many fail-safe mechanisms that was built into the large ship.

An important safety mechanism that gave the builders much confidence about the Titanic unsinkable was the construction of 16 watertight compartment S and a double bottom which would make it almost impossible for the ship to sink.

the service industry in the united states grew in the late 1800s. what was one effect of that growth?

the number of people with jobs in factories as unskilled workers decreased.

the number of people with jobs in factories as unskilled workers increased.

the middle class grew as people took jobs as clerks, lawyers, and teachers.

the middle class shrank as people left jobs as clerks, lawyers, and teachers.

i would have to say "a" or "d".