[Guyver Spawn]

I do agree. Something may be not be relevant to today's world, but still be important to history and should not be forgotten. If I put up a timeline of important toku, it could be like this.

1954 - Godzilla (May not be the first Toku ever, but it did help create Toku that we know today)
1958 - Gekko Kamen (The first TV superhero in Japan and help create the toku tropes that we know today)
1966 - Ultraman
1971 - Kamen Rider
1975 - Goranger
1992 - Zyuranger
1993 - MMPR
1995 - Juukou B-Fighter (As mention before from someone else)

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It actually did neither of these things. I mean, it definitely made them more popular than ever before, but both things had existed in the US before Power Rangers. You had the Dynaman joke dubs in the mainland as well as Goranger and Battle Fever J being aired in Hawaii. Ultraman and Ultra Seven were also widely broadcast throughout the US.

Not to mention, you had other Toku release in the US. Godzilla movies was big in movie theathers in the 60's-70's. Those movies also found a new audience when they would be on home video and TV in the 80's and 90's. You would also have other giant monster movies and non kajiu Toku that did well in the states too.

MMPR help create a new audience for Toku, but you had fans way before MMPR even existed. Kamen Rider and Sentai had many fan sub tapes in the 80's and 90's that would people would watch.