Some of the great global demonstrations in the 20th century were those against the Vietnam War. In the largest demonstration, on October 15, 1969, 250,000 people came to the demonstration in Washington, D.C. , to demonstrate against the war in Vietnam.
On October 10, 1981, about 300,000 people gathered in the Hofgarten in Bonn and demanded nuclear disarmament in a peaceful demonstration against the NATO double decision. On 25 October 1981, 200,000 people demonstrated for the same reason in Brussels, and on 21 November 1981, 400,000 people demonstrated in Amsterdam. In Bonn, on the occasion of a state visit of US President Ronald Reagan, a demonstration with about 500,000 people took place on 10 June 1982 (see also Peace Movement).
On February 15, 2003, more than 10 million people worldwide demonstrated against the impending war in Iraq, most of them in Europe. In Berlin alone, about 500,000 people took to the streets.
In non-democratic states, such as the former Eastern bloc countries, only state-ordered, state-sponsored demonstrations were allowed. Other demonstrations were violently put down (for example, on 17 June 1953 in the GDR). Another example was the 1989 student protests in the People's Republic of China, which were bloodily ended by the army at gunpoint in the Tian'anmen massacre.
The Monday demonstrations of 1989 in the final phase of the GDR were completely free of violence.
In 2007, the demonstration concept Out of Control emerged among left-oriented, anti-authoritarian groups in order to systematically complicate police operations and tactics such as walking kettles or preventive surveillance of gatherings.
With the proliferation of mobile phones and social networks, it is now possible to inform a group of like-minded people of an event and/or call them in much more quickly than in the past. This also favoured rallies in Iran and China, as well as the revolutionary upheavals in 2011 in Tunisia, Egypt and other countries (see Arab Spring).