The global protest wave, explained

From the article:

Only 20 years ago, 70 percent of protests demanding systemic political change got it — a figure that had been growing steadily since the 1950s.
In the mid-2000s, that trend suddenly reversed. Worldwide, protesters’ success rate has since plummeted to only 30 percent, according to a study by Erica Chenoweth, a Harvard University political scientist who called the decline “staggering.”