Ohio
From just over 45,000 residents in 1800, Ohio's population grew at rates of over 10% per decade (except for the 1940 census) until the 1970 census, which recorded just over 10.65 million Ohioans. Growth then slowed for the next four decades. The United States Census Bureau estimates that the population of Ohio was 11,689,442 on July 1, 2018, a 1.33% increase since the 2010 United States Census. Ohio's population growth lags that of the entire United States, and Caucasians are found in a greater density than the United States average. , Ohio's center of population is located in Morrow County, in the county seat of Mount Gilead. This is approximately south and west of Ohio's population center in 1990.
History of Iowa
By 1850, there were 192,214 people living in Iowa. Nearly 90% of the population at this time was from America, with Ohio, Indiana, and Pennsylvania contributing the most settlers. Though immigration from other parts of the world had not yet hit full stride, there nonetheless existed 20,969 foreign immigrants in 1850. The largest group was the Germans with over 7,000, followed by the Irish with 4,885, England with 3,785, Canada with 1,756, the Netherlands with 1,108, 712 from Scotland, 361 from Norway, 231 from Sweden, and 19 from Denmark. Czechs also comprised a large settlement group. Settlement patterns to this point generally were in the southern and eastern parts of the state, often near the rivers. Immigration during this time was affected by many things, notably: the completion of railroads to the Mississippi, the advertising of Iowa lands by railroad and steamship companies, the publication of favorable guides and articles, drought in the Ohio Valley, and a cholera epidemic in other states. One fine example of a guide is John B. Newhall's "Sketches of Iowa: Or, The Emigrant's Guide," written in 1841 for prospective British emigrants. Additional examples include Nathan Parker's "Iowa as it is in 1855: a Gazetteer for Citizens, and a Handbook for Immigrants" and John Taylor's "Iowa: the "Great Hunting Ground" of the Indian; and the "Beautiful Land" of the White Man: Information for Immigrants". Other factors affecting immigration were frequently religious and political oppression in the immigrant's homeland, as well as economic problems in the homeland.