Halted the use of Rainbow Herbicides in SE Asia. Extracted us from a no-win war (one we refused to win). And saved Israel in 1973.
Nixon also started the EPA and OSHA, instituted socialistic wage & price controls creating shortages, and worst of all took us completely off the gold standard resulting in massive inflation of the 70s.
I'm no expert, but IMHO without the groundwork of Nixon there'd be no BH0 and his healthcare takeover.