Norodom Sihanouk was associated with the Sangkum Reastr Niyum party in Cambodia. However, it is important to note that he was a political figure who often shifted allegiances and alliances throughout his career, so his party affiliation may have changed over time.
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I apologize for the oversight in my previous response. Norodom Sihanouk was actually a member of the FUNCINPEC party (National United Front for an Independent, Neutral, Peaceful, and Cooperative Cambodia) in Cambodia. He founded the party in 1981 and played a key role in its establishment and development. Thank you for pointing out the error, and I appreciate the opportunity to correct it.