Conversation so far:
why does neon gas in a tube turn fluoresce bright orange when electricity is passed through it
Neon lights give an electrifying red orange colour due to each element giving off a few characteristic wavelengths of light when it's electrons are excited
When was neon gas discovered
Neon was discovered in 1898 by William Ramsay and Morris Travers at University College London.
When was the neon lamp developed
Georges Claude first to applied an electrical discharge to a sealed tube of neon gas around 1902. He displayed the first neon lamp on December 11, 1910
Where was the first neon lamp displayed
Georges Claude displayed the first neon lamp on December 11, 1910, in Paris.

Question: When did the US start using the signs
Self-contained rewrite: When did the US start using neon signs