26Kellogg–Briand Pact

The 1928 Pact of Paris is an international agreement that outlawed war. The period after its signing saw a significant decline in conflicts around the globe, though it didn't stop World War 2.
27. Some people have argued that USA legally holds sovereignty over Taiwan due to the Treaty of San Francisco, which was signed at the end of World War II. In 2006, a group of Taiwanese residents unsuccessfully filed a complaint asking for Taiwanese residents to receive US Constitutional rights for this reason.
28. United States leases the land beneath the Guantanamo Bay detention facility from Cuba for $4,085 per year. The agreement was made after the Spanish-American War. Since taking power in 1959, the Cuban communist government has consistently protested against the U.S. presence on Cuban soil and refuses to cash the checks sent by USA.
29. The Bureau of Indian Affairs still sends bolts of cloth every year to New York Indian tribes as part of the debt owed from the Treaty of Canandaigua of 1794.
30. Florida has an agreement with Canada which allows Canadians to pay in-state tuition rather than out-of-state tuition for all 40 state-funded colleges and universities.
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31Anglo-French-Turkish Treaty

In 1939, Turkey signed a Mutual Aid Pact with the United Kingdom and France but backed out at the last minute to avoid war with the USSR. They later signed a friendship treaty with Nazi Germany in 1941.
32. The Treaty of Guadalupe Hidalgo, which would end the Mexican-American War, was the result of insubordination. President Polk had ordered Nicholas Trist of the State Department to terminate negotiations. Trist disobeyed, believing a breakthrough was imminent. Polk had no choice but to accept.
33. According to Treaty Of Tripoli which was signed in 1796, the United States government "is not, in any sense, founded on the Christian religion, as it has in itself no character of enmity against the laws, religion, or tranquility, of Muslims."
34. NATO’s Mutual Defense Agreement only applies to territory in North America, Europe, and islands above the tropics. Technically, Hawaii falls outside of these requirements, and, if attacked, would not immediately activate the mutual defense clause.
35. The Portuguese and Spanish colonial empires were once so powerful that in 1494 they signed the Treaty of Tordesillas which divided the newly discovered lands outside of Europe between Spain and Portugal along a meridian 1100 miles west of the Cape Verde islands. The border between Indonesia and Papua New Guinea was indirectly set by this treaty.