"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
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In an oration, July 4, 1836, W. W. Coriell, in speaking of the struggle between Madison and Dubuque for the capital, said: "Only three years have elapsed since the white man came into possession of the country in which Dubuque is situated, and already, including the county of Des Moines, it is estimated that we number more than twelve thousand inhabitants on the west side of the Mississippi, being about one-half of the population of the whole country of Wisconsin. Our town and its immediate vicinity has doubtless a population of two thousand industrious and enterprising citizens as any to be found in the broad extent of the United States. Dubuque, from its commanding situation, being easy of access from any point, from the fertility of the soil and the vast mineral resources of the country in its vicinity, from the number of its population, being greater than that of any other town in the territory, may well aspire to be the capital." — (Visitor, July, 1836.)
The plans for Iowa to extend north to the St. Peter's River were widely accepted until 1845. To avoid leaving Dubuque in other than a central position, Edward LANGWORTHY, at the 1844 Iowa Constitutional Convention, proposed to move the northern boundary of Iowa northward to meet the 45th parallel where it crossed the Mississippi. This would have positioned Dubuque in a commanding central location in Iowa. The motion did not succeed. Disappointment was obvious when, in 1846, Iowa was admitted to the Union with the knowledge that the present capital, Iowa City, would be replaced by Des Moines.
Oldt, Franklin T. History of Dubuque County. http://www.ebooksread.com/authors-eng/franklin-t-oldt/history-of-dubuque-county-iowa-being-a-general-survey-of-dubuque-county-histor-tdl/page-5-history-of-dubuque-county-iowa-being-a-general-survey-of-dubuque-county-histor-tdl.shtml