How did this amendment affect participation in the America political process

The question looks to be about the Amendment 26th which expanded the possible voter base of the USA

Explanation:

Amendments are changes tot he constitution which the parliament can make with the changing time and the needs to change laws according to the time of the government.

It was widely understood as a constitutional need that the voter base of the country needed to be more inclusive to represent the aspirations of all the citizen of the country.

Thus the 26th amendment brought in young voters who are a part of the education system into the fold as first time voters, This made the focus of the elections to shift towards education and made the Representation more inclusive.