Category:20th century in the United States by state or territory

• 20th-century elections in the United States by state‎ (10 C)

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• Years of the 20th century in the United States by state or territory‎ (156 C)

A

• 20th century in Alabama‎ (17 C, 1 P)
• 20th century in Alaska‎ (15 C, 1 P)
• 20th century in American Samoa‎ (12 C, 4 P)
• 20th century in Arizona‎ (17 C)
• 20th century in Arizona Territory‎ (4 C)
• 20th century in Arkansas‎ (15 C)

C

• 20th century in California‎ (19 C, 8 P)
• 20th century in Colorado‎ (18 C)
• 20th century in Connecticut‎ (17 C)

D

• 20th century in Delaware‎ (16 C)

F

• 20th century in Florida‎ (22 C)

G

• 20th century in Georgia (U.S. state)‎ (16 C)

H

• 20th century in Hawaii‎ (17 C, 4 P)

I

• 20th century in Idaho‎ (16 C)
• 20th century in Illinois‎ (17 C, 1 P)
• 20th century in Indian Territory‎ (2 C)
• 20th century in Indiana‎ (17 C)
• 20th century in Iowa‎ (15 C)

K

• 20th century in Kansas‎ (15 C)
• 20th century in Kentucky‎ (16 C)

L

• 20th century in Louisiana‎ (17 C, 1 P)

M

• 20th century in Maine‎ (15 C)
• 20th century in Maryland‎ (17 C)
• 20th century in Massachusetts‎ (18 C, 2 P)
• 20th century in Michigan‎ (15 C)
• 20th century in Minnesota‎ (19 C)
• 20th century in Mississippi‎ (16 C, 2 P)
• 20th century in Missouri‎ (19 C)
• 20th century in Montana‎ (16 C, 1 P)

N

• 20th century in Nebraska‎ (15 C)
• 20th century in Nevada‎ (17 C)
• 20th century in New Hampshire‎ (16 C, 1 P)
• 20th century in New Jersey‎ (18 C, 1 P)
• 20th century in New Mexico‎ (14 C)
• 20th century in New Mexico Territory‎ (2 C)
• 20th century in New York (state)‎ (19 C)
• 20th century in North Carolina‎ (18 C)
• 20th century in North Dakota‎ (15 C)
• 20th century in the Northern Mariana Islands‎ (10 C)

O

• 20th century in Ohio‎ (19 C)
• 20th century in Oklahoma‎ (20 C, 1 P)
• 20th century in Oregon‎ (16 C, 2 P)

P

• 20th century in Pennsylvania‎ (18 C)
• 20th century in Puerto Rico‎ (20 C, 4 P)

R

• 20th century in Rhode Island‎ (15 C)

S

• 20th century in South Carolina‎ (16 C)
• 20th century in South Dakota‎ (16 C, 5 P)

T

• 20th century in Tennessee‎ (17 C)
• 20th century in Texas‎ (21 C)
• History of the Trust Territory of the Pacific Islands‎ (4 C)

U

• 20th century in Utah‎ (17 C, 2 P)

V

• 20th century in Vermont‎ (15 C, 2 P)
• 20th century in the United States Virgin Islands‎ (13 C)
• 20th century in Virginia‎ (16 C, 1 P)

W

• 20th century in Washington (state)‎ (17 C)
• 20th century in Washington, D.C.‎ (12 C)
• 20th century in West Virginia‎ (15 C)
• 20th century in Wisconsin‎ (16 C, 1 P)
• 20th century in Wyoming‎ (16 C)