According to this Ngram there had been a rise in using the word "revolution" through 1986 and 1969.
What could be the reason? could it be because of a special upheaval in the world?
Any answer is appreciated!
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It's easily explained. 1968 is remembered as a year of political upheaval and change (see Protests of 1968). These years saw protest movements and political upheaval in the West, but also among Pact of Warsaw members and in other countries. Many of these events had a profound effect over the following years,, e.g.:
Furthermore, much of Africa had recently gained its independendence (see Decolonisation of Africa).
Other events that had a huge impact in 1969: