Increased life expectancy for women
Development of the service industry
Advancements in household technology
U.S nationalism is based on patriotism that fosters the feeling of identity among Americans. The fact that American share a common history from the founding of the country through to the overcoming of the various challenges bind them together. Complications to a national identity in the United States include racism and the calamity of slavery that beset the country from its founding.
They were striking a blow for freedom against imperialism(b)
Democratic government I believe