Which state entered the union 1916 as an officially bilingual state?

A total of 31/50 US states have English as an official language:

Hawaii

Alaska

California

Arizona

Utah

Colorado

Wyoming

Idaho

Montana

North Dakota

South Dakota

Nebraska

Kansas

Oklahoma

Louisiana

Arkansas

Missouri

Iowa

Illinois

Indiana

Kentucky

Tennessee

Mississippi

Alabama

Florida

Georgia

South Carolina

North Carolina

Virginia

Massachusetts

New Hampshire