North America, 13 May 1846: Outbreak of the Mexican–American War
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Political map of North America & the Caribbean on 13 May 1846 (Manifest Destiny: Outbreak of the Mexican–American War), showing the following events: Coup of Mariano Paredes; Second separation of Yucatán; Crossing the Nueces Strip; Thornton Affair; Siege of Fort Texas; US Declaration of War on Mexico.

U n i t e d

S t a t e s o f

A m e r i c a

C a n a d a(Br.)

R u p e r t ' s L a n d(Br./HBC)

Oregon
Country(US/Br. joint occ)

The
Bahamas(Br.)

Newfoundland(Br.)

Unorganized
Territory

Leeward Islands(Br.)

Windward
Islands(Br.)

Nova Scotia(Br.)

British
Guiana(Br.)

Puerto
Rico(Sp.)

Iowa
Territory(US terr.)

P.G. of
Oregon(US infl.)

Mosquito
Kingdom(Br. prot.)

Lakota
Sioux,
Cheyenne

Iron Confederacy

Great
Basin
peoples

Wisconsin
Terr.(US terr.)

Dutch
W. Indies(Neth.)

Disputed
Territory(US-Mex disp)

St P. & M.(Fr.)

Bay Is.(Br. ctrl)

14 Dec 1845–3 Jan 1846Paredes seizes
power in Mexico

Jan 1846Yucatan declares
independence

Mar 1846US marches to
Rio Grande

25 Apr 1846Mexicans ambush
US forces near
Fort Texas

3–9 May 1846Mexicans besiege
Fort Texas but are
driven off

13 May 1846US declares
war on Mexico

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