The best replacement for treaties is executive agreements.

The best alternatives to treaties are rated as following:
★★★★★  executive agreements
★★  conventions
★  indian act
  international law
  us constitution
  agreements

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Speaking about treaties, one probably shouldn't forget about foreign countries.

Other search terms related to treaties and their ratings are:
★★★★★ foreign countries
★★★ indian tribes
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treaties
executive agreements
conventions