The difficulties in the US can be traced to three facts about the United States: elections (including eligibility standards and voting processes) being constitu

The difficulties in the US can be traced to three facts about the United States: elections (including eligibility standards and voting processes) being constitutionally the responsibility of the states, citizens having free movement between the states, and jus soli citizenship. (I would personally say the latter two are good things about the US, but not the first.) Add to that the difficulty in getting the states to go along with the federal government without being compelled, and you have an intractable problem.