The tag wiki for michigan says
Migration to Michigan has principally been internal after people entered the USA through one of the ocean ports.
Is that true? I think the wiki should provide proof for such a claim.
If you doubt a statement in the wiki (and can refute it) then edit what is there now. That is the nature of a wiki.
In this case, it appears that a statement such as "X was the main port of entry to Michigan for migrants from outside the USA in the years M-N" would resolve the issue (or at least challenge the source of the original assertion).
I was born and raised in the Midwestern United States; have several sets of immigrating ancestors who came in the second half of the 19th century.
I don't think the line about Michigan migration adds anything to the tag description; it may detract.
As for my Irish and Norwegians who came to the Midwest in the 19th century, I don't presume they arrived at a US coastal port. Several of those families or their related families either went through the port at Quebec or first immigrated to Canada, only to immigrate to the US still later (Michigan--mostly Detroit or Saginaw). Ha! One of them immigrated to the US, but still later immigrated to Canada.
You guys decide, but consider that Michigan is a border state. Ask yourself if the other information adds anything meaningful to the Wiki tag description.
Since this is a discussion, some additional information. This from Dr. Marlou Schrover, Universiteit Leiden.
The Migration to North America
http://www.let.leidenuniv.nl/history/migration/chapter52.html Quotes that follow are in the order discovered and not intented to be in a meaningful order:
In one century (1820-1924), 7 Million people went to Canada. 6 million of them moved on to United States later.
Most of the population of Canada before 1945 originally came either from England or France (Quebec: 25% French).
35 - 40 Million Europeans went to the United States between 1820 and 1924. The bulk of the movement occurred after 1875.
Many of the immigrants - some 12 million - landed at Ellis Island in New York Harbour for immigration inspection.