I thought this might be interesting and any additions , changes, criticisms etc. would be appreciated. It is a list of things that I have seen change, to varying degrees, the face of US chess:
Elo Rating: Just look around to see the tremendous impact ratings have had on the USCF. One not so recognized impact has the diminishing influence of the chess club. Local and national rated tournaments outside the chess club has become preeminent in activity and importance over the chess club which had been the focus of virtually all quality chess.
The Jet Plane: Perhaps the jet plane more than anything else has brought the world of chess together – It led to: more tournaments, more titled USCF players and coordinating playing and organization rules with other national federations.
Exodus of strong chess players from the Soviet Union: It has been said and I believe it that the emigration of Soviet GMs to the USA improved the play of our top stars. Led by Alburt, Korchnoi and eventually Kasparov, it raised the level of what it would take to win a major tournament and had a trickle down impact on our tournament players of all levels. More of our players played overseas and the USCF did most of the coordination and selection.
The demise of Soviet political influence: also had another effect. In the past international chess elections were dominated by the Soviet Foreign ministries applying pressure to governments of satellite and under developed FIDE nations. This anti-chess way of winning elections and deciding issues began a diminishing influence of USCF on FIDE politics and for a time made it much harder for our stars to receive international titles.
The Rise of Florencio Campomanes: As the Soviet domination of world chess was declining albeit in a limited way, their domination was replaced by one outstanding and controversial man - Florencio Campomanes. Under Campo, in terms of member nations, the world chess organization – FIDE became the second largest sports organization in the world. Part of his personal domination was partially attributed to questionable bribery. Personally I saw the bribery as secondary and very limited. His domination was clearly the result of his personal visitations to the countries and institution of special benefits to them such as chess equipment and GM simultaneous exhibitions arranged through FIDE.
The Chess Computer result ins the end of the adjourned chess game. This was highlighted in the playing of a decisive role in the Lyon/NY 1985 World Championship between Karpov and Kasparov. Both players used computers to analyze adjourned games. One player had access to an under-development computer program being written by Hans Berliner which was the superior program and helped decide the outcome of the match… My memory is a little foggy on the details here but for sure the rise of the computer usage put an end to adjourned chess games. In the Fisher/Spassky world championship match virtually every store window in Reykjavik had the position of the adjourned game asking what is the best move? That led to great publicity the likes of which is now lost forever.
The Internet: Its impact on USCF and world chess has so far been limited likely IMO will eventually have great impact.
Scholastic Chess growth and Chess in Schools: Due to some very dedicated and hard-working USCF organizers and teachers, Scholastic chess play has enhanced the image of chess in the US vastly expanded USCF membership.