Which amendment was made possible by the advances in technology, allowing faster travel and communication?

The 26th Amendment, lowering the voting age from 21 to 18.

Context/details:

One way in which faster travel and communication pushed the progress of the 26th Amendment was in terms of the protest movements going on during the 1960s, leading up to 1971 when the 26th Amendment was passed by Congress and ratified by the states.  Protests against the Vietnam War were active on college campuses across the country, with communication between students and media reports being a big part of the story.  Part of those protests were the demands of young people chanting, "Old enough to fight, old enough to vote."  Since 18 was old enough to be drafted to fight in the war, young people argued for their right to vote as full citizens.

The 26th Amendment was passed by Congress on March 23, 1971.  It was ratified by the states faster than any other amendment, achieving ratification by July 1, 1971.

The 26th Amendment is worded as follows:  

c.) the country needed a stronger central government.

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