Mr. Dodge, having been re-elected, returned to Washington with the determination of carrying out his instructions so far as the boundary question was concerned. And so, on December 19, 1845, he asked leave to introduce "A Bill to define the boundaries of the State of Iowa, and to repeal so much of the act of the 3rd of March, 1845, as relates to the boundaries of Iowa." The original copy of this bill, which has been preserved in the office of the Clerk of the House of Representatives, bears testimony to Mr. Dodge's fidelity to promises made to the people; for the description of boundaries therein is a clipping from the Preamble of the printed pamphlet edition of the Constitution of 1844. In discussing the question later in the session he referred to his pledges as follows: "I know, Mr. Chairman, what are the wishes and sentiments of the people of Iowa upon this subject. It is but lately, sir, that I have undergone the popular ordeal upon this question; and I tell you, in all candor and sincerity, that I would not be in this Hall to-day if I had not made them the most solemn assurances that all my energies and whatever influence I possessed would be exerted to procure for them the fifty-seven thousand square miles included within the limits designated in their original constitution. It was in conformity with pledges that I had given them personally, with instructions which I knew I had received from them at the ballot-box, that I introduced, at an early day of the present session, the bill imbodying the boundaries of their choice."
It was not, however, until March 27, 1846, that Mr. Stephen A. Douglas, from the Committee on the Territories to whom Mr. Dodge's bill had been referred, reported an "amendatory bill." This bill, which was introduced to take the place of the original bill, rejected the boundaries of the Constitution of 1844 and proposed the parallel of forty-three degrees and thirty minutes as the Northern boundary line of the new State. It was committed to the Committee of the Whole House on the State of the Union, wherein it was discussed on the eighth of June and reported back to the House. On the ninth of June the amendatory bill was taken up by the House and passed. It was reported to the Senate without delay, but was not passed by that body until the first day of August. On the fourth day of August the act received the approval of President Polk.
The most important discussion of the bill was in the House of Representatives on the eighth day of June. An attempt was made to reduce the State on the North. Mr. Rockwell, of Massachusetts, moved to amend by striking out the words "forty-three and thirty minutes" where they occur and inserting in lieu thereof "forty-two degrees." He understood from a memorial which had been presented to the House that the people in the Northern part of the Territory did not wish to be included within the proposed boundaries.
Mr. Douglas said that he was now in favor of the new boundaries as proposed by the Committee on the Territories. He declared that the boundaries of the act of March 3, 1845, "would be the worst that could be agreed upon; the most unnatural; the most inconvenient for the State itself, and leaving the balance of the territory in the worst shape for the formation of other new States." As to the memorial from Dubuque recommending the parallel of forty-two degrees, Mr. Douglas said that he was aware of the influences which produced it. The people of Dubuque "wished either for such an arrangement as should cause Dubuque to be the largest town in a little State, or else to make it the central town of a large State."
Mr. Rathburn, of New York, was opposed to the lines laid down in the bill. He favored less extensive boundaries because he desired to preserve "the balance of power" in the Union by the creation of small States in the West. He "was against making Empires; he preferred that we should have States in this Union."
Mr. Vinton, of Ohio, said that in the last session of Congress "no question except that of Texas had excited more interest in the House." He did not think that the people of the Territory should decide the question of boundaries; and he asserted that "if Congress was willing to let the people of Iowa cut and carve for themselves, he did not doubt that they would have their State extend to the mouth of the Columbia."
The strongest speech, perhaps, in the whole debate was that of the Iowa Delegate. Mr. Dodge reviewed the history of the boundary dispute and pointed out that both he and the people of Iowa had pursued a firm and honorable course. He showed that many of the States were as large as or even larger than the proposed State of Iowa. Referring to the boundary proposed in the act of March 3, 1845, he said: "It will never be accepted by the people of Iowa." But he produced letters to show that the Iowa Convention of 1846 were willing to accept the compromise boundary proposed in the bill under discussion. "Thus, sir, it is now apparent that, if the House will pass the bill reported by the Committee on Territories, it will put an end to this question. The convention of Iowa have met the advances of the Committee on Territories of this House."
Mr. Vinton then "moved an amendment, fixing the 43d parallel as the northern boundary." This was a tempting proposition. But Mr. Dodge stood firmly for the parallel of forty-three degrees and thirty minutes, and closed his remarks with these words: "I admonish the majority of this House that if the amendment of the gentleman from Ohio is to prevail, they might as well pass an act for our perpetual exclusion from the Union. Sir, the people of Iowa will never acquiesce in it."
From the Journal of the Iowa Convention of 1846, it appears that when the Committee on Preamble and Boundaries made their report on the morning of the second day of the Convention they recommended the compromise boundaries which had already been proposed by the Committee on the Territories in the National House of Representatives. But when the report was taken up for consideration several days later an amendment was offered which proposed to substitute the boundaries as described in the Constitution of 1844. On a test ballot the vote of the Convention stood twenty-two to eight in favor of the amendment. This was on the eighth of May. Six days later a resolution instructing the Committee on Revision to amend the article on boundaries so as to read as follows was adopted by a vote of eighteen to thirteen:
"Beginning in the middle of the main channel of the Mississippi river, at a point due east of the middle of the mouth of the main channel of the Des Moines river; thence up the middle of the main channel of the said Des Moines river, to a point on said river where the northern boundary line of the State of Missouri, as established by the Constitution of that State, adopted June 12th, 1820, crosses the said middle of the main channel of the said Des Moines river; thence westwardly, along the said northern boundary line of the State of Missouri, as established at the time aforesaid, until, an extension of said line intersects the middle of the main channel of the Missouri river; thence, up the middle of the main channel of the said Missouri river, to a point opposite the middle of the main channel of the Big Sioux river, according to Nicollet's map; thence up the main channel of the said Big Sioux river, according to said map, until it is intersected by the parallel of forty-three degrees and thirty minutes north latitude; thence east, along said parallel of forty-three degrees and thirty minutes, until said parallel intersects the middle of the main channel of the Mississippi river; thence down the middle of the main channel of said Mississippi river to the place of beginning."