While I certainly appreciate your service, I assume it was not done in early 19th century, unless I am grossly underestimating your age. I cannot see how serving and understanding the Irish immigration to the US can be remotely relevant.
The fact is that, Irish weren't allowed to be police in significant numbers in either US or Canada till later in the 19th century do to widespread racism. Their roots were in construction of the Eastern railways, canals and bridges of which their cheap labour founded the basis of American infrastructure. Women were often employed as servants, cooks (ironically) if unmarried.
During the next wave of immigration as a result of the potato famine in the early 20th century, immgrants were largely disposed to farming and generally skilled as such.
Suggesting that their major role, was that of policemen, is with all due respect, absurd.
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