I'm guessing the first nine years of the 1920s. America was booming. Everybody seemed to be full of enthusiasm for what was fast becoming - if it was not already - the most prosperous country economically in the world. Great Britain had held that position up until 1900 or so, but the USA had surpassed her. People were flocking to the USA! It was the land of opportunity.
Of course, the great Wall Street Crash of 1929 brought that all to a halt for the next ten years. But World War Two got the country up and running again. Okay, it was mostly the production of war materials that spurred things along, but the USA rode the waves of prosperity then for quite a few decades.
That all began to go pear-shaped when big business decided it was cheaper to employ workers off shore where wages are cheap, there is no trade union protection, and just about anything goes. But that's another story.