The correct answer is - Globalism.
The globalism has been the process that made a global village out of the world, at least most of it, and resulted in the emergence of a new international popular culture.
This process has been going on gradually for almost a century now, but it has speed up significantly in the past couple of decades. Int he essence of the globalism is that it creates one big global market where the trade can function freely. The exchange of the information, ideas, and technologies to be easy and accessible to everyone form every corner of the world. The travel and communication of the people to be as easy s possible throughout the globe.
This has led to the merging of multiple cultures, some of which became more popular, and they started spreading around the globe as international popular cultures.
There's only few countries that still refuse to engage in this process, like North Korea and Turkmenistan for example.