I love the topic of voting systems, but... we can't even get rid of the fucking penny over here. The odds of the U.S. changing its voting methodology are so infinitesimal, I'm having trouble conceptualizing it.
You mean how Maine just passed Rank-Choice (Instant Runoff) voting as law? [1]
"On November 8 [2016], Maine voters passed Question 5 and became the first state in the nation to adopt Ranked Choice Voting for state and federal elections. The Yes On 5 campaign was led by the Committee for Ranked Choice Voting, a grassroots, Maine-based organization founded by former independent state senator Dick Woodbury of Yarmouth, and led by Kyle Bailey of Gorham." [2]
[1] https://en.wikipedia.org/wiki/Instant-runoff_voting
[2] http://www.fairvote.org/maine_voters_adopt_ranked_choice_vot...
Or start using it in nongovernmental orgs, and likewise gain experience and familiarity.