The term PART OF SEATO is composed of two crossword solutions: EAST (4 letters) and ASIA (4 letters). SEATO stands for the Southeast ASIA Treaty Organization, which was a military alliance established in 1954 by the United States, France, the United Kingdom, Australia, New Zealand, Thailand, Pakistan, the Philippines, and the Kingdom of Siam (now Thailand). The purpose of the organization was to prevent the spread of communism in Southeast ASIA. The two solutions, EAST and ASIA, refer to the geographical area covered by the treaty, which included EAST ASIA and Southeast ASIA.