sevo
Fokutorendaburando
As Tom said much of the 50's and 60's were captured on Tri-X. But the bulk of the imagery captured during the 20th century was on Kodak film.
Even in the US Kodak weren't that dominant for most of the 20th century - at times, big competitors like Ansco or Dupont had quite significant market shares, and the many small makers accounted for a lot too. Elsewhere Kodak often did not even enter the market until the sixties or seventies - the film markets in the bigger European countries still were dominated by national makers up into the sixties to nineties. And even that still is a Euro-American biased view that does not account for the majority of the global population that lived in parts of the planet where Kodak film was unobtainable.