Yes I know
Yes, I know that the beginning is not the best of timelines plausibility wise, but I wrote this to have some fun, so I think it should be OK.
1860: Abraham Lincoln loses the Presidential election, narrowly avoiding a Civil War.
1876: Hayes is elected President of the United States. Florida secedes from the Union, saying that without a single vote from the south, this is not an American Union; this is a Northern Union, shattering the joy of the nations Centennial Birthday. Florida begins to seize federal forts and arsenals.
1877: Floridian troops fire on Fort Pickens, the only Federal Fort remaining within Florida’s borders. Georgia, Alabama, Mississippi, South Carolina, Louisiana, Texas, North Carolina, and Tennessee secede and unite with Florida to form the Confederate States of America, with the capital at Atlanta, Georgia. A constitution is soon approved by the Provisional Confederate Congress, and soon an aging Jefferson Davis is elected President of the Confederacy. The Confederate Armed Forces begin to mobilize, and the US Army does the same, preparing to invade and reunite the country by force. Industrialization of the south begins as only Richmond, Atlanta, Montgomery, New Orleans, Austin, and Houston have a strong industrial base, and this was thanks to the thinking of secessionists in 1860. When they realized they needed industry to have chance at beating the north, they began to pay for industrial centers in there home states.
1878: The CSA, finally mobilized, invades Arkansas and Virginia, but try to win over the people by causing as little damage as possible and paying for the supplies they take. Due to this general hospitality, Virginia and Arkansas vote to join the Confederacy. Kentucky soon follows, and the Confederate Armed Forces begin to swell with new troops and recruits. Seeing it as unable to wait any longer, the United States Navy begins to set up a blockade of the CS coast. The CS Army once again begins to prepare there new soldiers for war with the Union.
1879: Taking advantage of the Confederacy's failure to act, the US Army of the Potomac invades western Virginia and begins to occupy that part of the state with little resistance as many of the western counties there were against secession and they send a petition to the US Congress to become the state of West Virginia. The US Congress agrees, and West Virginia is soon admitted to the Union as its own state. The Confederate Army of Northern Virginia led by Thomas Jackson, soon moves his Army across the Potomac and begins to prepare for siege operations against Washington DC. After several weeks of preparation, the siege begins, with the US Federal Government still inside the city. 125,000 more Confederate troops are sent north to help defend Kentucky and Arkansas.
1880: Washington finally falls to CS troops and military generals of the USA announce the collapse of the Old Union and the formation of the Imperial States of America. Which instantly recognizes the CSA and cedes West Virginia, Delaware, and Maryland (as well as Washington DC), in return for the old Union’s government and a peace treaty (the Treaty of Brussels), which are then placed in power as the new nation’s government. The ISA soon drastically weakens Congress to about 2/3 of its former powers, giving the rights to declare war and peace to the President. The CSA’s people soon begin to celebrate at the collapse of the Old Union and their victory over the north, which had dominated the South for nearly a century in the Old Union.
1881: The ISA, (drastically needing money for a recently planned war against Britain to take over Canada), offers to sell the Indian, New Mexico, and Arizona Territories to the Confederacy for 12 million dollars, which the Confederacy eagerly accepts, and the Treaty of Atlanta completes the sale.
1882: The ISA begins to mobilize its armed forces to its full and complete strength, the CSA is soon notified by IS President-General Ulysses S. Grant however, and hostilities are avoided when the ISA also tells the CSA it will not be viewed as aggression if the CSA mobilizes as well.
1883: IS troop levels reach 800,000 troops, 75 ironclad steam frigates, 200 small gunboats, 150 large gunboats, 300 heavy artillery, 200 light artillery, and 200,000 cavalry. Plans for the invasion of Canada begin to be drawn up and completed. 1884: The Plans for the invasion of and conquest of Canada are completed, and IS troops begin to form 4 huge armies of 200,000 troops each with 50,000 cavalry added to the main armies, making each army total 250,000 men each. The Imperial American Navy produces 27 ironclad steam frigates and they join the main naval body, which prepares to blockade Canada. The Imperial States of America and the Confederacy sign a non-aggression pact for 10 years.1885: The ISA finally launches its invasion of Canada, and taking the Canadians unawares, seizes Toronto, Quebec City, Montreal, Regina, and Vancouver as well as occupying the Maritime Provinces and the southern third of Manitoba, British Colombia, Saskatchewan, Ontario, Quebec, and Alberta by November. Meanwhile, the Confederacy begins to greedily eye Mexico and Latin America, as like the United/Imperial States with the Wild West and Canada, its Manifest Destiny, and Confederate forces begin to modernize as fast as possible while warfare technology is purchased from Prussia, Russia, France, and the United Kingdom.
1886: Imperial American troops continue to advance upon the Canadians, and rebellion breaks out in Quebec against the Canadian government and the Quebecious Republic is formed in the Southern part of the province while the Native American Confederation is formed in the northern part of the province as well as in parts of Labrador. The Quebecious Republic is soon peacefully occupied by the ISA, as independace is promised by the wars end. Britain begins to send troops to Canada as well as naval assistance in the form of mercenaries, hoping to avoid out right war.
1887: The ISA finishes its conquest of Alberta, Saskatchewan British Colombia, Ontario, Manitoba, Labrador, and half of Quebec. The Battle of the Cape takes place between an Imperial American Squadron and an Anglo-Canadian Squadron off the coast of Southern Africa, and although it is a small battle, it give the ISA control of the Cape of the Good Hope and the surrounding sea lanes, and British merchants begin to be mercilessly attacked by IS Warships, causing both the ISA and Britain to declare outright war on each other, and the Atlantic War begins, with Imperial ships winning several major victories over the older British Navy, although many battles are also won by the British due to mere numbers, although those fleets are eventually crushed by the more stronger American vessels. IS troops continue to advance against the Canadians.
1888: The final defeat of the Anglo-Canadian Fleet occurs on July 23rd, 1888, when a huge American Fleet of 38 ironclad steam frigates and 19 gunboats utterly defeats the enemy, taking no prisoners except for Cabin boys and children, which are escorted back to port and held as POW’s, although they are treated as American children would be. American troops finish the conquest of Canada, creating 3 new nations out of Quebec, Labrador, Newfoundland, Nunavut, and parts of the Northwest Territories, and they are called: the Native American Confederation (Pink), to which all Native American in the old NAC migrated too, the Republic of Northern Quebec (Black), and the Quebecious Confederation (South Quebec, Green). These new nations soon announce the collapse of Canada and its incorporation into the ISA and their own independence as well as declaring war on Britain. The Federal government of Canada soon surrenders to the ISA officaily, and all hostilities are ended as it signs the surrender document. Britain, reeling from its loss of most of its navy and the loss of millions due to American destruction of its commerce, surrenders week later, officaily ending the 3rd Anglo-American War.