Add a comma or semicolon if needed. Otherwise, submit the text without any additional punctuation. Allan Pinkerton moved to the United States from Scotland and he started a famous private detective agency in Chicago.

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Allan Pinkerton moved to the United States from Scotland, and he started a famous private detective agency in Chicago.

Allan Pinkerton moved to the United States from Scotland, and he started a famous private detective agency in Chicago.

To determine whether a comma or semicolon is needed in the given sentence, let's examine the context and the relationship between the two clauses:

"Allan Pinkerton moved to the United States from Scotland" is the first clause.

"He started a famous private detective agency in Chicago" is the second clause.

In this case, since the two clauses are closely related and form a complete thought, we can use a coordinating conjunction (like 'and') to connect them.

To rewrite the sentence, we can add a comma before the coordinating conjunction 'and':

"Allan Pinkerton moved to the United States from Scotland, and he started a famous private detective agency in Chicago."

Now, the sentence is correctly punctuated.