Alright, the 1931 Huang He flood is averted. Thusly, communist forces gain much less sympathy among the Chinese people. Nationalist forces retain control of China, whilst communists are stranded on Hainan.
The Chinese fight against the invading Japanese forces much more successfully, but still ultimately meet defeat. America and Britain give tons of aid to the fledgling democracy that is China after the war, and the rebuilding process begins.
The Korean War happens, but where Chinese forces were the deciding factor in turning back the American offensive in our timeline, they aid the American advance near the end of the war. Korea is unified under a democratic banner.
Vietnam and the rest of South East Asia also go much differently. Communist rebellions are put down by the French with help from willing Chinese and American allies. Vietnam attains independence under a democratic government July 3rd, 1960. Laos and Cambodia follow shortly thereafter.
JFK, beloved by some, but many considered him a lame duck. His one term presidency is noted for his many problems with the then republican congress. Richard Milhous Nixon was elected in 1964 in a successful Republican bid for the White House. Watergate never happens, and Nixon becomes one of America's most beloved presidents - both leading the charge for civil rights and facing down "Godless Soviet communism".
Near the end of his term, Nixon visits China in 1972 to attend a conference on the destabilizing situation in Hainan...