What happens if election fraud is found after a president is elected?
There is nothing in the Constitution, or the laws of the United States, that would allow overturning a presidential election, after the House (and Senate) have completed their obligations under the Constitution (Twelfth Amendment) and the Electoral Count Act.
No presidential election has ...
Since the U.S. is given as an example, there is a simple item that is missing on your list:
Complexity/convolution of the election process.
A trustworthy election process should not only be transparent but also as simple and coherent as possible, since it is quite obviously a bad thing if you have to explain the results to voters.
Since every U.S. state does ...