| 1 |
Marshall Plan (1948) |
283 |
90.42% |
1889 |
| 2 |
Creation of the United Nations (1945) |
201 |
64.22% |
1366 |
| 3 |
Treaty of Alliance with France (1778) |
155 |
49.52% |
1269 |
| 4 |
Louisiana Purchase (1803) |
169 |
53.99% |
1179 |
| 5 |
Lend-Lease Act (1941) |
175 |
55.91% |
1160 |
| 6 |
Creation of NATO (1949) |
185 |
59.11% |
1028 |
| 7 |
Creation of the Bretton Woods System (1944) |
112 |
35.78% |
621 |
| 8 |
Act Prohibiting the Importation of Slaves (1807) |
82 |
26.20% |
601 |
| 9 |
Monroe Doctrine (1823) |
79 |
25.24% |
476 |
| 10 |
Handling of the Cuban Missile Crisis (1962) |
80 |
25.56% |
468 |
| 11 |
Nuclear Nonproliferation Treaty (1968) |
86 |
27.48% |
427 |
| 12 |
Immigration Act of 1965 |
84 |
26.84% |
395 |
| 13 |
Berlin Airlift (1948-1949) |
81 |
25.88% |
372 |
| 14 |
Opening to China (1971-72) |
95 |
30.35% |
362 |
| 15 |
Good Neighbor Policy Toward Latin America (1933) |
63 |
20.13% |
324 |
| 16 |
Entry into World War I (1917) |
68 |
21.73% |
320 |
| 17 |
Management of the Collapse of the Soviet Union (1990-1991) |
67 |
21.41% |
306 |
| 18 |
Support for the Reunification of Germany (1990-1991) |
76 |
24.28% |
288 |
| 19 |
Proclamation of Neutrality (1793) |
43 |
13.74% |
277 |
| 20 |
SALT I Agreement and the ABM Treaty (1972) |
64 |
20.45% |
271 |
| 21 |
Helsinki Final Act (1975) |
59 |
18.85% |
265 |
| 22 |
Limited Test Ban Treaty (1963) |
56 |
17.89% |
260 |
| 23 |
Override of Reagan’s Veto of the Anti-Apartheid Sanctions Bill (1986) |
59 |
18.85% |
253 |
| 24 |
Camp David Accords (1978) |
81 |
25.88% |
249 |
| 25 |
American Relief Mission to Post-WWI Europe (1919) |
46 |
14.70% |
229 |
| 26 |
Purchase of Alaska (1867) |
61 |
19.49% |
219 |
| 27 |
Adams-Onis (Transcontinental) Treaty (1819) |
34 |
10.86% |
212 |
| 28 |
Truman Doctrine (1947) |
38 |
12.14% |
208 |
| 29 |
Panama Canal Treaties (1978) |
56 |
17.89% |
186 |
| 30 |
Intermediate Range Nuclear Forces Treaty (1987) |
41 |
13.10% |
164 |
| 31 |
Treaty of Versailles (1919) |
29 |
9.27% |
163 |
| 32 |
Destroyers-for-Bases Deal (1940) |
32 |
10.22% |
157 |
| 33 |
Washington Naval Conference and the Four-Power, Five-Power, and Nine-Power Treaties (1921-1922) |
29 |
9.27% |
147 |
| 34 |
Open Door Policy with China (1899-1900) |
31 |
9.90% |
140 |
| 35 |
Creation of the General Agreement on Tariffs and Trade (1947) |
31 |
9.90% |
138 |
| 36 |
Iran Nuclear Deal (2015) |
51 |
16.29% |
133 |
| 37 |
START Agreements (1991, 1993) |
36 |
11.50% |
132 |
| 38 |
Salt II Treaty (1979) |
39 |
12.46% |
126 |
| 39 |
Yalta Conference (1945) |
21 |
6.71% |
105 |
| 40 (tie) |
Trent Affair Diplomacy (1861) |
18 |
5.75% |
102 |
| 40 (tie) |
Formal Recognition of the People’s Republic of China (1979) |
34 |
10.86% |
102 |
| 42 |
Jay Treaty (1795) |
22 |
7.03% |
96 |
| 43 |
Creation of the Organization of American States (1948) |
19 |
6.07% |
86 |
| 44 |
War of 1812 |
13 |
4.15% |
85 |
| 45 (tie) |
Mexican-American War (1846-1848) |
18 |
5.75% |
84 |
| 45 (tie) |
Suez Canal Crisis (1956) |
27 |
8.63% |
84 |
| 47 |
Declaration of Neutrality in World War I (1914) |
19 |
6.07% |
81 |
| 48 |
Oregon Treaty (1846) |
20 |
6.39% |
78 |
| 49 |
Recognition of Israel (1948) |
24 |
7.67% |
76 |
| 50 (tie) |
Spanish-American War (1898) |
13 |
4.15% |
68 |
| 50 (tie) |
NATO Expansion (1994) |
28 |
8.95% |
68 |
| 52 (tie) |
Anglo-American Convention of 1818 |
10 |
3.19% |
62 |
| 52 (tie) |
Liberation of Kuwait (1991) |
19 |
6.07% |
62 |
| 54 |
Egyptian-Israeli Peace Agreement (1979) |
23 |
7.35% |
60 |
| 55 |
Tehran Conference (1943) |
11 |
3.51% |
56 |
| 56 |
Annexation of Texas (1845) |
12 |
3.83% |
52 |
| 57 |
Alliance for Progress (1961) |
14 |
4.47% |
51 |
| 58 |
North American Free Trade Agreement (1993) |
21 |
6.71% |
50 |
| 59 |
Creation of the World Trade Organization (1995) |
24 |
7.67% |
49 |
| 60 |
Intervention in Kosovo (1999) |
12 |
3.83% |
48 |
| 61 |
Entry into Korean War (1950) |
16 |
5.11% |
42 |
| 62 |
Teller Amendment (1898) |
10 |
3.19% |
39 |
| 63 |
Potsdam Agreement (1945) |
8 |
2.56% |
38 |
| 64 |
Bombing of Hiroshima (1945) |
5 |
1.60% |
31 |
| 65 |
Embargo on Aviation Fuel, Scrap iron, and Oil to Japan (1940-1941) |
7 |
2.24% |
27 |
| 66 |
Taiwan Relations Act (1979) |
8 |
2.56% |
25 |
| 67 (tie) |
Annexation of Hawaii (1898) |
7 |
2.24% |
24 |
| 67 (tie) |
Senate Rejection of the Treaty of Versailles (1919) |
5 |
1.60% |
24 |
| 69 |
Permanent Normal Trade Relations for China (2000) |
10 |
3.19% |
23 |
| 70 |
Invasion of Iraq (2003) |
4 |
1.28% |
20 |
| 71 |
Dollar Diplomacy (1909-1913) |
6 |
1.92% |
19 |
| 72 (tie) |
Withdrawal from the Iran Nuclear Deal (2018) |
5 |
1.60% |
18 |
| 72 (tie) |
Withdrawal from the Trans-Pacific Partnership (2017) |
5 |
1.60% |
18 |
| 74 (tie) |
Indian Removal Act (1830) |
5 |
1.60% |
17 |
| 74 (tie) |
Intervention in Lebanon (1958) |
3 |
0.96% |
17 |
| 76 |
Embargo of 1807/Non-Intercourse Act of 1808 |
3 |
0.96% |
16 |
| 77 (tie) |
Neutrality Acts (1935-1939) |
3 |
0.96% |
14 |
| 77 (tie) |
Support for Israel in Yom Kippur War (1973) |
3 |
0.96% |
14 |
| 79 |
Withdrawal from the Paris Climate Agreement (2017) |
4 |
1.28% |
13 |
| 80 (tie) |
Bombing of Nagasaki (1945) |
3 |
0.96% |
12 |
| 80 (tie) |
Senate Rejection of the Comprehensive Nuclear Test Ban Treaty (1999) |
2 |
0.64% |
12 |
| 80 (tie) |
Invasion of Afghanistan (2001) |
4 |
1.28% |
12 |
| 83 (tie) |
Vietnamization (1969) |
3 |
0.96% |
10 |
| 83 (tie) |
Economic Decoupling from China (2018-2020) |
7 |
2.24% |
10 |
| 85 |
Withdrawal from ABM Treaty (2001) |
1 |
0.32% |
9 |
| 86 |
Enhanced Interrogation of Terrorism Detainees (2002) |
1 |
0.32% |
7 |
| 87 (tie) |
Indian Appropriations Act of 1871 |
1 |
0.32% |
6 |
| 87 (tie) |
Overthrow of Ngo Dinh Diem (1963) |
2 |
0.64% |
6 |
| 87 (tie) |
Intervention in Libya (2011) |
2 |
0.64% |
6 |
| 90 |
Iran-Contra Affair (1986-1987) |
2 |
0.64% |
5 |
| 91 (tie) |
Nonrecognition of New Latin American States (1818) |
1 |
0.32% |
4 |
| 91 (tie) |
Platt Amendment (1901) |
1 |
0.32% |
4 |
| 91 (tie) |
Limits on Jewish Refugees from Germany (1939-1944) |
1 |
0.32% |
4 |
| 91 (tie) |
Crossing the 38th Parallel in the Korean War (1950) |
3 |
0.96% |
4 |
| 95 (tie) |
Annexation of the Philippines (1899) |
1 |
0.32% |
3 |
| 95 (tie) |
Support for the Overthrow of Iranian Prime Minister Mohammad Mosaddegh (1953) |
1 |
0.32% |
3 |
| 95 (tie) |
Bay of Pigs Invasion (1961) |
2 |
0.64% |
3 |
| 96 |
Admitting the Shah of Iran into the United States (1979) |
1 |
0.32% |
2 |
| 97 (tie) |
Deployment of Combat Forces to Vietnam (1965) |
1 |
0.32% |
1 |
| 97 (tie) |
Kennedy Round of Trade Negotiations (1967) |
1 |
0.32% |
1 |
| 98 (tie) |
Nonrecognition of Haiti (1804) |
2 |
0.64% |
0 |
| 98 (tie) |
Forcible Removal of Cherokee Nation (1838) |
0 |
0.00% |
0 |
| 98 (tie) |
Indian Appropriations Act of 1851 |
0 |
0.00% |
0 |
| 98 (tie) |
Chinese Exclusion Act (1882) |
0 |
0.00% |
0 |
| 98 (tie) |
Dawes Act (1887) |
0 |
0.00% |
0 |
| 98 (tie) |
Suppression of the Boxer Rebellion (1900) |
0 |
0.00% |
0 |
| 98 (tie) |
Intervention in Nicaragua (1912) |
0 |
0.00% |
0 |
| 98 (tie) |
Interventions in the Dominican Republic (1912, 1916) |
0 |
0.00% |
0 |
| 98 (tie) |
Occupation of Veracruz (1913) |
0 |
0.00% |
0 |
| 98 (tie) |
Pershing Expedition (1916) |
0 |
0.00% |
0 |
| 98 (tie) |
Intervention in Russia (1918-1920) |
0 |
0.00% |
0 |
| 98 (tie) |
Immigration Act of 1924 |
0 |
0.00% |
0 |
| 98 (tie) |
Smoot-Hawley Tariff (1930) |
0 |
0.00% |
0 |
| 98 (tie) |
Refusal to Recognize People’s Republic of China (1949) |
1 |
0.32% |
0 |
| 98 (tie) |
Support for the Overthrow of Guatemalan President Jacobo Arbenz Coup (1954) |
0 |
0.00% |
0 |
| 98 (tie) |
Gulf of Tonkin Resolution (1964) |
0 |
0.00% |
0 |
| 98 (tie) |
Secret Bombing and Invasion of Cambodia (1970) |
0 |
0.00% |
0 |
| 98 (tie) |
Support for the Overthrow of Salvador Allende (1973) |
0 |
0.00% |
0 |
| 98 (tie) |
Support for the Mujahideen in Afghanistan (1981-1989) |
0 |
0.00% |
0 |
| 98 (tie) |
Intervention in Lebanon (1982) |
0 |
0.00% |
0 |