1970's Kraftwerk/Parliament Funkadelic/George Clinton
1982 - Juan Atkins, aka Cybotron - along with the futurism of the time and the Korg MS20 Synth.
1985-1988 - Chicago house was also happening influenced by disco.
1985-1988 - Juan Atkins influenced Derrick May and Kevin Saunderson in Detroit (all of them were also known as the Belville Three). Detroit techno was born.
1988 - Acid house was the new Chicago thing. Phuture are said to have produced the first 303 record 'Acid Tracks'. But like with anything in the USA, this is open to debate lol.
1989 - Garage took over in NY, influenced by the house sound. But Nu Groove etc also started to produce a more techy sound.
1988-1990 Techno came to Europe in a big way but kicked off in Belgium (R&S/Ferrari Records who did the newbeat thing were heavily influenced by the New York thing at first)
1989/90 - R&S (Belgium) released CJ Bolland/Joey Beltram and eventually Aphex Twin (the whole electronica movement). We also had Frank De Wulf etc. The sound spread to Holland
1989 - Holland took hold of techno and eventually created Gabber.
1989 - UK took hold of techno and eventually made hardcore.
This could be disputed as techno was already in europe before 88 as electronic dance music had been gaining interest since the late 70`s with throbbing gristle up to the early 80`s, when clock DVA and other more dance based industrial acts carried things on.
Then came the EBM movement from people like (Belgian) front 242 who in 1984 were already banging out 909 and drum machine based 4 to the floor tracks dance tracks with an abstract futuristic edge. They toured the States that year and arguably had an influence on electronic music there, along with other EBM acts.
Tracks such as Commando, No Shuffle, Special Forces, techno was already alive and well in Europe.

IT is very difficult to trace techno reliably, as everyone likes to take credit, with the Detroit guys having the loudest voices, the only thing that could possibly be traced definitively is the word techno being used to describe electronic dance music.
Electronic music history in europe is very complicated and web like. The american side is much simpler.