In the 1800s, what new technology helped nations build and maintain their empires? machine gun
railroad
telephone
telegraph

Telegraph

Explanation:

The telegraph was created by Samuel Morse in 1830s and 1840s. It transmitted electrical signals over a wire laid between stations, Morse also created his code that assigned a sets of dots and dashes to each letter and allowed the transmission of complex messages across the telegraph.

This new invention helped imperial nations to communicate, information came quickly from European powers and the code made easier to pass complex information easily.

operation overlord was the codename for the battle of normandy, the allied operation that launched the successful invasion of german-occupied western europe during world war ii. the operation was launched on 6 june 1944 with the normandy landings

id say bottom left to top top left to bottom right and middle to middle

explanation: