Final answer:
Factors that have helped American popular culture spread globally include the global influence of the United States, globalization and technology, and cultural sharing and diversity.
Step-by-step explanation:
The factors that have most helped American popular culture spread throughout the world over the past 50 years are:
Global influence of the United States: After World War II, the United States emerged as a global power, and its troops stationed in various countries exposed their hosts to American traditions, sports, and norms.
Globalization and technology: The increase in international trade and advancements in communications technology, such as the internet and social media, have made it easier for American culture to spread worldwide. Hollywood movies, American music, fast food chains, and popular American franchises have become accessible to people around the globe.
Cultural sharing and diversity: While Hollywood movies and American recording artists continue to be major players, the 21st century has witnessed the rise of diverse cultural phenomena from other countries, such as Japanese anime and South Korean K-pop. These cultural exports combine elements of American and local cultures, showing that globalization is a two-way process of cultural sharing.