Churchill was asking the United States to help fight along British's forces in Europe.
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!
Internment of Japanese Americans. The internment of Japanese Americans in the United States during World War II was the forced relocation and incarceration in concentration camps in the western interior of the country of about 120,000 people of Japanese ancestry, most of whom lived on the Pacific Coast.
The correct answer is: "the Enlightment period".
The Enlighment movement emerged in Europe and was constituted by philosophers that promoted Reason and the scientific method over medieval superstition and religious dogmas, and the establishment of democratic societies where the power resided on its people, and not in monarchs or rulers "appointed by God". The resulting states enacted bills of civil rights for the first time in history, and implemented principles such as the division of powers or the social contract, through which citizens elected their governors by suffrage.
Such Enlightment principles were transferred to the American colonies, where the population claimed for political representation rather than being governed by foreigners that were appointed by a foreign king. Such claims were ignored and, influenced by the new democratic principles, the revolutionary movements for independence aroused.