format experimentation, I'll be honest I kind of fudged much of the Hoover-Allred section and the post-Sverdlovist Soviet Union states but it is what it is
1913-1916: Woodrow Wilson (Democratic)
with Thomas R. Marshall (1913-1916)
'12 def. Theodore Roosevelt / Hiram Johnson (Progressive), William Howard Taft / Nicholas M. Butler [replacing James S. Sherman] (Republican), Eugene V. Debs / Emil Seidel (Socialist)
'16: Pres. Wilson, Vice Pres. Marshall resigned after appointing Hughes Secretary of State to ensure steady post-election transition
1916-1921: Charles E. Hughes (Republican)
with Charles W. Fairbanks (1917-1918)
'16 def. Woodrow Wilson / Thomas R. Marshall (Democratic)
'17: American entry into the Great War
1921-1923: Woodrow Wilson (Democratic)
with Edwin T. Meredith (1921-1923)
'20 def. Charles E. Hughes / Warren G. Harding (Republican), Eugene V. Debs / Seymour Stedman (Socialist)
'23: Pres. Wilson died of stroke
1923-1925: Edwin T. Meredith (Democratic)
1925-1929: William G. McAdoo (Democratic)
with A. Victor Donahey (1925-1929)
'24 def. Frank O. Lowden / Miles Poindexter (Republican), Robert La Follette Sr. / Victor Murdock (Progressive)
1929-1933: Alvan T. Fuller (Republican)
with Charles Curtis (1929-1933)
'28 def. William G. McAdoo / A. Victor Donahey (Democratic)
1933-1937: James M. Cox (Democratic)
with John Nance Garner (1933-1937)
'32 def. Alvan T. Fuller / Oscar Carlstrom (Republican), Norman Thomas / James H. Maurer (Socialist)
1937-1949: Herbert Hoover (Republican)
with Henry Wallace (1937-1941), William J. Donovan (1941-1949)
'36 def. James M. Cox / John Nance Garner (Democratic), Huey Long / Elmer Lundeen (Share Our Wealth)
'40 def. John Nance Garner / Paul V. McNutt (Democratic), Robert La Follette Jr. / James W. Ford (Popular Front)
'42: American entry into the Anti-Soviet War
'44 def. Paul V. McNutt / John J. Bennett Jr. (Democratic)
1949-1953: William J. Donovan (Republican)
with Dwight H. Green (1949-1953)
'48 def. George H. Earle III / Alben Barkley (Democratic), Strom Thurmond / Benjamin T. Laney ("Southern" Democratic)
1953-1954: James Allred (Democratic)
with Frank J. Lausche (1953-1954)
'52 def. William J. Donovan / Dwight H. Green (Republican), Charles Lindbergh / Dewey J. Short (Independent)
'54: Pres. Allred shot in apparent assassination plot on Cuban President Álvarez; DOI suspects Italian involvement
1954-: Frank J. Lausche (Democratic)
(some of the) Leaders attending the First Congress of Sovereign States, c. 1954:
Second Armenian Republic: Prime Minister
Simon Vratsian (Armenian Popular Democrats)
Azerbaijani Democratic Republic: Prime Minister
Mustafa bey Vakilov (Musavat)
Belarusian People's Republic: Prime Minister
Mikoła Abramčyk (Belarusian Party of Christian Democracy)
Republic of Finland: Prime Minister
Juho Paasikivi (National Coalition)
Federal Republic of Georgia: President
Shalva Maglakelidze (National Union)
Federal Republic of Kazakhstan: Prime Minister
Mustafa Shokai (Alash - "Right Tendency")
Russian Republic: Prime Minister
Nikolai Voznesensky (Russian Labor Bloc)
Republic of Tajikistan: President
Abdulkodir Muhiddinov (Ittifok)
Republic of Turkmenistan: President
Karash Yomudsky (Independent)
Ukrainian Republic: President
Danylo Skoropadsky (Union of 29 April)
Republic of Uzbekistan: President
Usmon Xoja (Young Uzbeks)