Skip to content Skip to a section
Tool·Lifes /Everything About War Search apps and topics…
Apps
Explore Guides
U United States military

History

Dated history of United States military (1775 origins; 1861-65 mass army; 1941-45 global peak; 1947 National Security Act as the modern department hinge) in A continental republic that became a global basing and alliance system after 1941.

Educational history. Casualty figures are documented ranges. This is not operational advice, a ranking of nations, or a how-to for weapons or coups.

At a glance
Timeline

Milestones in order. This is history, not a weekly activity grid.

1775 Continental forces1861-65 Civil War mass army1917-18 AEF in France1941-45 Global mobilisation1947-07-26 National Security Act1949 NATO1950-06-25 Korea begins1951-04-11 MacArthur relieved1953-10-01 US-ROK treaty signed1973 / 1986 AVF and Goldwater-Nichols
  1. Continental forces
  2. Civil War mass army
  3. AEF in France
  4. Global mobilisation
  5. National Security Act
  6. NATO
  7. Korea begins
  8. MacArthur relieved
  9. US-ROK treaty signed
  10. AVF and Goldwater-Nichols
Score intensity

Darker cells mean a higher score for this topic on that metric.

Last reviewed Sources & creditsMedia creditsMethodology

Quick answers

Are the scores a ranking of nations or armies?

No. Scores are browsing aids inside an era-bounded atlas — not live league tables of countries.

Why is the Civil War notable here?

It was the first US mass industrial army and a cost on the American Civil War page. It is not the origin of the 1947 department.

How does Korea fit?

1950-53 was the first large hot war of that department and produced the 1953 US-ROK treaty. Inchon, Ridgway, and the armistice are dated hinges. See the Korean War and Inchon pages.

What was MacArthur's relief?

President Truman relieved General MacArthur on 11 April 1951 -- a civil-military crisis in a shooting war. A political history, not a staff-college stunt to copy.

Is this a current force list?

No. No live ORBAT, no basing directory, no nuclear employment, no special-operations method.

What was Goldwater-Nichols?

A 1986 law pushing joint service operations -- an institutional reform date in the public file.

Start with this section - History

1775 and 1861 are origins of scale, not of the Pentagon. 1947 is the legal hinge.

1950 belongs in the opening, not in a "later wars" shrug.

Timeline

  1. Continental forces

    A revolutionary origin, not yet a Pentagon.

  2. Civil War mass army

    The first industrial-scale US force.

  3. AEF in France

    A late mass expedition.

  4. Global mobilisation

    The industrial peak.

  5. National Security Act

    Department, CIA, USAF as a legal shape.

  6. NATO

    A European alliance structure.

  7. Korea begins

    The first hot war of the new department.

  8. MacArthur relieved

    Civilian control as a crisis.

  9. US-ROK treaty signed

    The peninsula bargain (into force 1954).

  10. AVF and Goldwater-Nichols

    Social then jointness hinges.

Eras

Republic to mass war

Militia politics then Grant's war.

Expedition to peak

AEF then a two-ocean war.

Department and Korea

A legal hinge and a hot war.

Vietnam and the draft's end

The social hinge.

Volunteer and joint

AVF; Goldwater-Nichols; long wars as public file -- not a tracker.

Milestones

26 July 1947

A department is written into law.

1950-53

The first hot war of that department.

1 October 1953

A treaty that still structures a peninsula -- as history.

The all-volunteer force is a social fact with a 1973 date.

This page will not become a post-9/11 tracker.

HistoryForcesCampaignsCostIconsLegacyAtlas