Trippy Crossroads: U.S. Psychedelia & Krautrock

Let's dive into the possible link that makes the late 1960s U.S. psychedelic rock and Krautrock, also called kosmische Musik, which was developed in then West Germany in the 1970s. An avant-garde yet psychedelic movement such as Krautrock and its bands like Can, Guru Guru, Cluster, Neu!, and La Düsseldorf tried to break free from the usual rock structures, while U.S. psychedelia was deeply indebted to the counterculture, with bands like The Doors, The United States of America, The Grateful Dead, and Lothar and the Hand People entering new dimensions through extended jams and experimental sounds.
Krautrock is overall typified by trippy, repetitious rhythms, electronic tones, often cosmic ambience, and a general tendency towards improvisation.
U.S. psychedelic rock features lush harmonies personalised by hypnotic jamming, surreal lyrics, as well as some experimental techniques such as reverb, and so forth. Are there any possible similarities? How could the attributes affect each other?
What are the possible similarities? In what way could the characteristics really have influenced each other? Did some 70s Krautrock artists incorporate elements of American psychedelic rock from the 60s?
How did they reflect social change?
What are the essential discographies in this cross-section of two psychedelic genres?