A device for transmitting long and short currents over wires was invented by who?

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate

according to my research (britannica and quizlet) the first settlements were along the huang river because it could give the crops more fertile soil that really it out. this was due to the yellow slit caused by floods of the river.

where is the map if i see it i can give you the answer