"started" is of course a big claim, but it's interesting to look at in any event.
Before the Constitution (2):
Shay's Rebellion
American Revolution
George Washington (1):
Whiskey Rebellion
John Adams0
Thomas Jefferson (1):
1st Barbary War
James Madison (4):
Anglo-American War of 1812
Cherokee Wars
Tecumseh's War
First Seminole War
James Monroe (1):
Florida Conflict
John Q Adams0
Andrew Jackson (3):
Black Hawk War
2nd Seminole War
Creek War
Martin Van Buren-John Tyler 0
James Polk (3):
Mexican-American War
Cayuse War
Navajo War
Zachary Taylor(1):
Apache Wars (beginning)
Millard Filmore (1):
Yuma War
Franklin Pierce
James Buchanan (2):
3rd Seminole War
Mojave War
Abraham Lincoln (6):
Civil War
2nd Black Hawk War
California Wars
Snake War
1st Dakota War
Colorado War
Andrew Johnson0
Ulysses Grant (1):
Great Sioux War
Rutherford Hayes-Grover Cleveland's first0
Benjamin Harrison (1):
Ghost Dance War
Grover Cleveland's second (2):
Hawaiian Revolution
Brazilian Naval Revolution
William McKinley (1):
Spanish-American War
Filipino Insurrection
Theodore Roosevelt (2):
Panamanian War of Independence
Dominican Intervention
William Taft0
Woodrow Wilson (5):
World War I
Haiti intervention
Nicaragua Intervention
Mexican Revolution
Russian Civil War
Warren Harding0
Calvin Coolidge (1)
Banana Wars action in Honduras and Nicaragua
Herbert Hoover0
Franklin Roosevelt (1)
World War II
Harry Truman (3)
Greek Civil War
Korean War
3rd Chinese Civil War
Dwight Eisenhower (2):
Guatemalan Coup
Iranian Coup
John Kennedy (1):
Bay of Pigs
Lyndon Johnson (2)
Dominican Intervention (Trujillo affair)
Vietnam War (counting this as one thing, and counting Johnson as the instigator, though Eisenhower was at the very beginning0
Richard Nixon-Gerald Ford0
James Carter (1)
Iranian Hostage Rescue attempt
Ronald Reagan (5)
El Salvador Civil War
Lockerbie Affair
Lebanon Civil War
Grenada Conflict
Contra Revolt
George Bush (2)
Noriega Conflict
Gulf War
William Clinton (6)
Colombian Drug Wars
Bosnian Civil War
Kosovo War
Strikes on Sudan
Somalian Peacekeeping
Haiti intervention
George W. Bush (4)
Haiti Intervention
2nd Gulf War
Taliban Wars
Taylor Conflict
Obama (3?)
Al-Shebab Conflict
Libya Civil War
Mission to capture Kony
I lumped together some of the conflicts in Lincoln and Wilson's eras, as well as lumping Vietnam into one big thing.
But either way, it marks Lincoln or Wilson as the biggest warmongers, largely because Lincoln stirred up a large anthill of Indian revolts in the California area, while Wilson was neck-deep in latin american fights. Clinton, interestingly, comes in third.
Monster Hunter: pissing me off since 2010.
