In 1941, more than 3 million cars were manufactured in the US

[Big Ivan]

The Lima Ohio tank plant is in operation producing about 11 tanks per month. It is operated by General Dynamics Land System Division and UAW local 2075.

In the 1940's:
In May 1942 construction began for Lima Army Tank Plant to manufacture centrifugally cast gun tubes in the steel foundry. This manufacturing method was rendered obsolete, so the army converted it to a tank depot for modifying and processing combat vehicles for export and domestic shipping.[3]

In November 1942, a GM subsidiary, United Motors Services, took over operation of the plant to process vehicles under government contract. The plant prepared many vehicles for Europe, including the M5 light tank and the M26 Pershing tank.

In the 1970's it became involved with Chrysler as the Army selected Chrysler's design for the new Abrams tank:

In 1976, the army selected Chrysler's design for what would become the Abrams tank, and designated the Lima plant, operated by Chrysler, to initially build the tank. The army pressured Chrysler, in financial difficulty, to form a subsidiary, Chrysler Defense, to hold and protect the tank contract from potential bankruptcy proceedings.

data is courtesy of Wikipedia.

Lima Ohio is about 1-2 hours from where I reside.