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Illinois plate were only prison made from 1933-1935. Illinois is one of the few states that have legislated against prison-made license plates They were made in the prison industry program despite the Depression-era cost of 6.4 cents per set. (That was "a lot" back then.) The prisons made the plates from 1933 to 1936, and these plates were re-issued without cost to vehicle owners as they were replacements. But the poor quality of the paint caused the Illinois Secretary of State to end the contract with the prison industry program and accepted bids from private contractors, who still make the plates today.
I can answer the "Why" part of your question. Soy Bean License Plates were made back in the World War II era because of the need for metal for the War effort. State such as Illinois, Montana, Virginia Georgia, and Alaska all had plates made from compressed Soy Beans and Fiberboard. These type of License Plates were made from 1942 to 1948, but not in all of these states. People started noticing, especially on the farms, that the License Plates were being eaten off the vehicles by goats and cows!
No
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The first license plates were issued in the German state of Baden in 1896. Massachusetts became the first state in the United States to manufacture license plates in 1903. The earliest license plates were made of leather, wood, and porcelain.
California Department of Prisons.
new york
They're made in one of Ohio's prisons.
because the state gets free labor from inmates.
456,976,000
26*10 = 260
France issued plates for motorized vehicles in 1893. In the US, New York was the first state to require license plates, but they were furnished by the owners and instead of a numbering system, displayed the owner's initials. In 1903, Maryland had the first state-issued plates which were made of porcelain.