Which development facilitated twenty-four hour factory operations, skyscraper construction, and mass transportation out of the inner city?
O Electric power
O Steam Engines
O The oil industry
O The steel industry

O Steam Engines

Explanation:

The steam engines is the development that facilitated 24 hours factory operations, skyscraper construction and mass transportation out of the city. This is because, the steam engine, is used to power the machines used in those industries. And, also, it powers the locomotives used in train as a means of transporting people from one point in the city to another location.

hello!

according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

hope this

explanation:

7 - to develop an asian ally

11- the red scare

14   the power of military -industrial complex

17 - the economy grew quickly

24 - the separation of church and state was not important