Final answer:
The United States decides to participate in treaties and international organizations through a variety of processes, including the use of treaties and executive agreements.
Step-by-step explanation:
The United States decides to participate in treaties and international organizations through a variety of processes. According to the U.S. Constitution, treaties are negotiated by the president and then ratified by the Senate with a two-thirds vote. However, in recent years, the majority of international agreements the U.S. enters into are executive agreements, which are negotiated solely by the president and do not require Senate ratification. The decision to use either treaties or executive agreements depends on the nature of the agreement and the political dynamics surrounding it.