1776 until 1861, the beginning of the Civil War
**** that! Slavery, people barely lived to be 50, children died at high rates, no indoor plumbing, heat, transportation, etc.... America was horrible then, and so was pretty much every place else.
1865 until 1900, Reconstruction
Life still sucked! Women were treated like slaves, people barely lived to 55, children died at high rates, little if any indoor plumbing, heat, transportation, deplorable working conditions in American factories, scandelous industries taking advantage of no regulation, etc.... In fact, the global economy was cast into depression because of a horse flu, in which industry basically ground to a halt most goods were moved in and out of ships/train yards by horse.
1900 until 1932, WWI, Roaring 20's, and Crash
Getting better, but not by much. Modern medicine was still in its infantry, wars were plaguing the world, communication was very limited, etc....
1933 until 1950, FDR, WWII, early Truman years
Again, getting better, but still days away. WWII was brutal, men often worked until they were too sick to continue or died, foreign goods were few and far between because war ground commerce to a halt. Civil rights were virtually non-existent in certain segments of the country.
1950's - Truman and Eisenhower
Getting even better. WWII allowed U.S. producers to retool their productive capacity to a high degree, there was more avenues for leisure, health care was embraced, and most of the country had indoor plumbing, modern heating, and access to new technology that made life much easier than it was before. The G.I. Bill helped pave the way for a more educated populace.
1960's - Kennedy, LBJ, Civil Rights and Vietnam
The era of leisure began. Life as an American who didn't get drafted into Vietnam wasn't that bad. There was greater access to international goods, and global travel and communication improved greatly. Most homes had telephones and televisions. Life expectancy continued to increase.
1970's - Nixon, Ford, Carter
Really just building on what i said above. There was a general fear regarding the nations struggle with crime.
1980-1992 - Reagan, Bush 41
The technology age begins, and leisure opportunities are more plentiful than ever. The fall of the U.S.S.R. was a relief of anxiety. Crime is still a major concern.
1993-2000 - The Clinton years
The digital/information age. The genome is unlocked, more than half of all households have a computer, automobiles are more safe, and crime rates fall across the board. Access to travel, goods and services, communication has never been greater.
2000-2008 - the Bush 43 years
Terrorism becomes a chief security concern. More than half of the country has mobile communication by 2008. The global economy goes into a steep recession, which causes quite a bit of anxiety for working class Americans. Medical advancements continue to push the envelope.
I really cannot think of any way that America was "better" or "greater" than it is now. I'm sure i missed a bunch of stuff, so feel free to correct me.