By the end of WWI which era had ended?

Their era, their world, had ended in 1914. The First World War certainly marked the end of an era for four mighty empires: Germany, Austria-Hungary, the Ottoman Empire and Russia.

Explanation:

is there multiple

the correct answer is: (1) affected by gerrymandering; (2) not affected by gerrymandering.

gerrymandering is known as a practice that intends to establish a some kind of political advantage for a particular party or group. to do this district boundaries are manipulated. the new resulting district is named a gerrymandering.

in other words, what gerrymandering does is to draw the boundaries of electoral districts trying to benefit the party who is doing it. sometimes, the party controlling the legislature will redraw it so they can maximize the number of districts they are likely to control.