Democratic traditions in other countries long predate even the existence of the US; it wasn't the first with universal suffrage; it had a troubled history even after that till at least the 1960s, even before we get to any contemporary problems.
I don't know there is a legitimate claimant on the "first democracy" title, or even if we are there yet, but unlikely the US.
So depending on the definition of "country", the oldest existing democracy is either Finland (1906-) or Norway (1913-)?
Finland: Universal suffrage from 1906, as an autonomous grand duchy of the Russian Empire. Independent country from 1917.
Norway: Independent country. Universal suffrage from 1913.
Or maybe, depending on the definition of "suffrage": New Zealand: Women can vote from 1893, women can run as candidates for some positions from 1919, Women can run for all position from 1941.
You don't give much weight for women to be able to be lawmakers themselves? As long as women have the right to vote male candidates to an all-male parliament, the suffrage is universal enough for you?
Clearly, in this case everybody being given that power of determination from 1893 has worked out well for them on the female representation front looking at current stars on the global leadership stage.
Money in politics probably as well.
Almost every country has some unevenness in apportionment. Outside of some microstates that have only one electoral disrict, by your definition no country is a democracy today.
A concern about removing the Electoral College is candidates won't spend time campaigning in more remote, less populous states. A) We have broadcast media and the Internet, you don't need to spend a lot of time in those states. B) Getting rid of the Electoral College doesn't mean getting rid of the state caucus and primary systems, there would still be plenty of in-state campaigning to win those (though typically not by an incumbent president).
Why should people living in a less populous state have more influence on the outcome of an election than people in more populous states (or cities)?
If people living in large cities have more influence it's not because of where they live but because there are more people. More people, more influence; the Electoral College dilutes this principle of fairness.
Anyone truly irked by this arrangement is free to move to Wyoming.
United States is perhaps the oldest continuously existing democracy [0], in has existed 244 years, and most of that time (about 200 years) it has been a two-party system. I don't think it's the two-party system that is responsible for the rotting now. Something else is going on.
[0] Well, we can debate how to define a democracy (an interesting and educational debate), and who is oldest still existing depends on the definition. But a good case can be made that it's the US.