More settles began moving west with

the completion of the trans continental railroad

Explanation:

It made the journey west, which had cheaper land, safer, cheaper,and more accessible to the masses

on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.