By June 1940 Hitler had pushed allied forces out from France. Hitler had never conquered Great Britain. He also had already succeeded in conquering the Netherlands and Norway. Lastly the U.S. wouldn’t join the war for another year. So the answer is Hitler had pushed allied forces out of France by June 1940.
Well an obvious answer would be slavery, depending on how late you're talking. After slavery ended, the country began what is known as the "industrial revolution". The north had already begun industrializing for a while, but in the 1870's and beyond, things ramped up quite a bit. Factories for clothes, shoes, farming equipment, packaged foods, and etc. became more popular. You also had coal mines, railroads, and steel mills. This showed the country was moving in the direction of mass production, and moving away from agricultural ways of living. This also meant child labor, which led to many child labor laws in the later years. This also meant many moved out of farming communities, and into larger, noisy, and crowded cities. Many immigrated to the US to take advantage of that, which led to some tension between communities.
Hope that helps!
Women won the right to vote on August 18, 1920
K good luck vro, hope you pass