Here are two maps of undersea cables. One from 1901 [HT: Boing Boing] and the other very recent.
Notice that the big change is the link between North America and Asia. Otherwise the distribution of the network looks largely unchanged.
Africa is very rapidly becoming more connected than that old (2004) map.
http://upload.wikimedia.org/wikipedia/commons/d/d4/Cable_map18.svg
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