England was choking the economies in the larger cities the same reason other European nation established colonies here
In regard to medication errors, the hospital should follow protocols in regard to checking the correct drug before purchasing it for their pharmacy. 2 licensed pharmacists should check the label for the correct drug and dosage. In regard to the nurses, they should always verify doctor's order prior to administration.
I believe that immigrants migrated to the United States because of the abundance of resources and work opportunities. Many also fled from wars and sought safety for their families and themselves. Difficulties that immigrants from the 19th century faced ,and still face now, was the idea of Racism and also how society saw them. Many also had trouble finding places to live or people to communicate with. Many formed small groups and communities to stay together with the people of their own race and culture for safety.