This latest and biggest outburst of defiance in the streets is at least partly due to the unilateral trade sanctions imposed on Iran last year by the Trump administration.
Labour sought to redistribute the wealth, the Conservatives tried to defend the existing order, and most people made their choices according to their position in the economic pyramid.
The fall of the Berlin Wall did not lead automatically to the benign reunification of Germany. It created the opportunity for positive change, but making it happen took clear thinking and hard political work.
Vladimir Putin’s recent visit to Saudi Arabia went well, because Saudi crown prince Muhammad bin Salman has been seeking friends elsewhere after Donald Trump did nothing in response to the recent drone attacks.
The tactics of today's protests have moved on from the strict nonviolence that characterized would-be democratic revolutions from the mid-1980s until the early days of the Arab Spring nine years ago.
So far, it has been almost entirely non-violent, but the traditional pro-independence civil society groups, the Catalan National Assembly and Omnium Cultural, are now being outflanked by Tsunami Democratic.
People have been nibbling around the fringes of the fuel problem, but biofuel won’t cut it: it would take an area the size of Australia to grow the plants needed as feedstock for the fuel that aviation industry consumes.