Plz i really need will mark brainliest! what are three innovations of the late nineteenth and early twentieth centuries and their effect on life in the united states?

The steam engine made transportation easier for humans. The telephone or telegraph made for easier communication. Electricity/the light bulb advanced sciences. That one is pretty self-explanatory.

observing traffic laws in exchange for driving on the highway.

cultural achievements of the 1920's 2010  

1. cultural achievements and african american achievements in the 1920’s  

2. art and literature charles lindberg flew from ny to paris, france. became national hero; first transatlantic flight.  

3. greenwich village (new york) and the south side (chicago)  many artists, writers, and intellectuals flocked to these areas to share ideas  people lead bohemian, or artistic and unconventional, lifestyles