Final answer:
Bob Dylan is the American songwriter who wrote the song This Land Is Your Land and greatly influenced folk rock artists during the counterculture period of the 1960s.
Step-by-step explanation:
One of the biggest influences for folk rock artists of the counterculture period is Bob Dylan, an American songwriter who wrote the song This Land Is Your Land. Dylan was a prominent figure in the 1960s, using his music as a catalyst for social change and speaking out against injustice and the Vietnam War. His songs, such as "The Times They Are a-Changin'" and "Masters of War," resonated with his generation and inspired others to join the anti-war movement.