Convergence refers to the phenomenon of many trends coming together to create social change and new trends. A single trend is important; a convergence of trends is powerful! The most profound social change occurs when different types of trends (economic, demographic, technological, social/cultural) come together.
The 1960s sexual revolution (the liberalization of sex – meaning it was no longer restricted to marriage) is an example of significant social change caused by the convergence of three different types of trends:
A more recent example of how the coming together of diverse trends can have explosive results: