I grew up to hear stories about POW in Chicago area.
Camp Skokie Valley had no fence around the prison. Many German descendants took them out for dinner and brought them back. MP guards sometimes yelled at them for being late. No one thought of escaping. The camp is now overgrown with woods.
Fort Sheridan was the major POW prison that held 4000 prisoners but it was a short-lived. Sub camps were Camp Pine, Camp Thornton, Arlington Fields and Camp Skokie Valley, each with 200 POWs. My hometown Arlington Heights used to have an alternative unpaved runaway (Arlington Fields) that became a temporary POW camp with 205 former Afrikakorps (most of them were 19 to 22 years old). After WWII, Arlington Fields became Defense Missile Site. Now, it's US Army Reserve and has 5 level bulk storage underground. The part of land is Arlington Golf Course.
Those prisoners worked on the runaways at Glenview Naval Station (two aircraft carriers on Lake Michigan) and built the chapel on the base (today it became The Glen mall). The lookout building and chapel are only remainders of the old naval air base. The chapel is most popular for weddings. Sometimes, they worked at Pesches's Flowers (still exists) in Des Plaines that was closer to the railroad tracks (no POW thought about the escape to hop in the freight train). All POWs worked many different jobs around Chicago except Rockford. They treated well and got paid when they returned home with gained weights. Only one escaped in 1943 and recaptured in Chicago in 1953. The major population outside Chicago was German descendants.
Those worked on agricultural majorly and worked at some industries. They dated some women and drank at the local taverns even going to the clubs and churches. After the war, many former POWs came back here to become the permanent residents.