Americans noticed that after the end of the Second World War, the geopolitical landscape of the world would change in favor of the United States, as it no longer had a threat in Europe nor had a threat in the Pacific Ocean, as the Empire of Japan was defeated during the war. This favorable scenario let the United States grow in economic and military power. Two processes that were perceived by the average American citizen, as job opportunities grew due to the development of the industry, leading to improving his or her living conditions.
True, the revolutions of the 1848 springtime of people succeeded.
The sky, The Sun, Adam, Eva
Religious and territorial conflicts.
European monarchs became absolute rulers in response to religious and territorial conflicts that later on resulted in warfare and revolts. After exploration, enlargement of territories and wealth, civil wars and external conflicts, kings became a lot more powerful which helped them to become absolute monarchs.