I would like to tell you about a country called the Grand Union of America, or GUA. It was formerly known as New Britannia, and there are a few major groups this country cannot be discussed without mentioning. First are the Pilgrims. Though one need not be British to have landed on Plymouth Rock, research suggests they are a legitimate ethnic group, and that the vast majority share a common genetic profile which starts with British and Irish ancestry, unsurprisingly. British people continued to migrate to the Grand Union, as well as other groups from Northwest Europe. Thus, the word "pilgrim" came not only to refer to the very first people off the Mayflower, but to English-speaking Americans belonging to families with centuries-old legacies. Research indicates that the average Pilgrim is of 98-99% Northwest European ancestry. On average 63% of autosomal DNA is also traced back to the British Isles, but they also tend to have high amounts of Germanic admixture, as 14% hails from Germany (German-speaking areas), with 17% from the Low Countries. 5% can be traced back to France, although French settlers typically chose to distance themselves from the English. There are an estimated 330 million Pilgrims. This brings me to my next point.
Acadians are a large, primarily Francophone group found in various regions of the GUA. As can be inferred, they make up a smaller group than Pilgrims. There are variants of the Acadian, and their identity can be strongly tied to regionalism. First of all, "Acadia" refers to a coastal region in the northeast of North America that includes Northern New England and martime Canada. This is where it all began, their Plymouth Rock. Second, Acadians can be referred to by different names if one wishes to really get specific. In the former Louisiana Territory, you will find "Cajuns." In Quebec, you will find Quebecois. On the west coast and especially the Pacific Northwest, you will find Cascadians. The Acadian population is estimated at 101 million strong. There are Italian, Spanish, and Portuguese Acadians as well as the French.
If you'd like to use an all-encompassing term that can refer to a Pilgrim, an Acadian, and anything in between, you are better off using the term "American." This can also refer to Pilgrims, Acadians, and immigrant groups living in the parts of the country that truly make it a Grand Union.
Another large group is the Italians, which largely came later, in the 19th century. Their population is estimated at 44-50 million.
As far as basic information goes, its capital is Philadelphia. This is part of the state of Galloway (named after Joseph Galloway, a major figure in the passage of the Reconciliation Acts of 1768). Galloway obviously includes Pennsylvania but also includes some of the other core colonies, some of the oldest such as Virginia, Maryland, Delaware, New Jersey, and New York. Other foundational states include New England (MA, CT, RI, VT, NH, ME), the Canadian Maritimes, Ontario, Quebec, and Carolina (NC and SC.). Each state is important, but key newer ones include Florida (Florida and Cuba) Austin (Texas, OK, KS, WY, UT, AZ), Dixie (TN, AK, LA, MS, AL, GA), Huron (MI, WI, MN, IA, IL, IN, OH,MS, KY.), Serena (CA, NV, OR, WA), and Montalucio (ID, MT, CO, ND, SD, NE.) Central Britannia, which is pretty much the core of the entire cross-continental country, is predominantly European, and they account for 81% of the population, although Hispanics, Africans, and Filipinos also live in there. However because of past trends many of these groups do have significant European admixture and some with very high admixture can look indistinguishable from Europeans. In this timeline, slavery was abolished in 1814, so it has fewer Africans, as they account for 2.5% of the population of the CCB. Additionally, half repatriated to Liberia (Note: In this scenario, Liberia has thrived, and with American guidance and investment it became comparable to South Africa.) The national currency of is the Grand Union Dollar ($).