At the end of the most recent ice age, which two continents were cut off from one another, dramatically affecting the course of human history?

Asia and North America

Explanation:

The Bering Strait was responsible to connect Asia and North America, allowing the population of these continents to cross, and populated them. However, when these continents were cut, this separation created geographic isolation and leading these populations to develop specific cultures and ways of living.

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new communications technology has affected the way social movements are organized because nowadays, social movements rely on social networks and the media to get different people with a similar way of thinking in contact, and thus, get them to mobilize for a greater cause.

individuals only participate in collective action when they feel identified with it. is in this aspect that social media becomes relevant, because it guarantees communication among all individuals and organizes the social actions that are going to be carried out, i.e., the social movements.

in addition, being covered by the media is important to validate the message and make it relevant in the social agenda, as well as to reach more people who can share interests, appealing to public sympathy for their cause.

in conclusion, it is by social networks and social media that social movement is given birth; by connecting different individuals with similar ideas and organizing them to mobilize for a greater cause.