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Or to allow hackers to brick your coffee maker, so you have to buy a new one.
There is no such thing as "the US system." Elections, including all of those for national office, are conducted by the individual states. Western states in particular are returning to paper in the form of mail-in ballots. Oregon and Washington are mail-in only; Colorado sends a mail-in ballot to every registered voter but still allows in-person voting at vote centers (last year, more than 80% of votes cast were cast by mail); Arizona and California have permanent no-excuse absentee ballot lists and both have more than 50% of votes cast being cast by mail.
The US (and the colonial areas before it was a country) has experienced at least three religious "Great Awakenings," the first starting circa 1730. These are generally associated with various sorts of social upheaval and/or populist movements, and the rise of new denominations. There are almost as many theories about why they occur as there are sociologists and/or historians who study them. My own (strictly amateur) interpretation for what is happening now is the collapse of rural America and the struggle to hold that off.
The US doesn't have a single power grid, it has three power grids that are almost completely independent of one another. Asking the renewable vs non-renewable question on a scale larger than the interconnect is inappropriate. And to some extent, asking the question on a scale smaller than the entire interconnect is an accounting fiction. Each of the three interconnects has a very different generating profile. Nevada is part of the Western Interconnect. Generation in the Western Interconnect as a whole runs 40-45% from non-fossil sources over the course of a year. The biggest contributor to that is conventional hydro power, with nuclear second. By 2016 or so, wind will overtake nuclear; sooner than that if any of the six commercial reactors operating in the Western Interconnect have major problems.
There have been a large number of nuts-and-bolts studies for doing low-carbon power in the US. All draw basically the same conclusion. It's straightforward to do in the Western Interconnect because of the available resources and geography. For the rest of the US it's an enormously harder problem.