My story for the Confederate's victory is this:
1863- Lee wins the battle of Gettysburg, which earns the Confederacy recognition from Britain and France, and force mediation between the USA and the CSA.
1863- But just weeks later, Lincoln orders another invasion, before the Emancipation Proclamation is declared, in response, Britain and France declare support for the C.S, and invade the United States, defeating the U.S yet again.
1863- Lincoln resigns from office, and the US, with huge debt from the civil war, plus reparations to the south, America falls into an economic depression, which lasts into 1871.
1871- Prussia unifies the German states, with the exception of Austria, and sympathetic to America, Kaiser Wilhelm I loans America money, which allows the U.S economy to get back on its feet, and America, grateful, to ally with Germany.
1875- The British create the HMS Dreadnought, ushering in the age of Battleships.
1914- The world is divided between the Allied Powers(Britain, France, Russia, Serbia, Greece, Romania, and the Confederacy) and the Central Powers(Germany, Austria-Hungary, Bulgaria, the Ottoman Empire, and the United States).
1914- On June 28th, Archduke Franz Ferdidand and his wife are shot to death by a Serb, and Austria declares war on Serbia in August.
1914- Austria is backed by Germany, while Serbia is backed by Russia, and Germany declares war on Russia and France, and invades Belgium to get to France, Britain then declares war on Germany.
1914- The U.S declares war on the C.S on August 8th, asked by President William Howard Taft. Confederate President Woodrow Wilson tries to mediate between the Allies and Central Powers, though America's declaration of war ends all hope for peace.
1914- Wilson orders the Confederates to capture Washington, and they advance deep into Maryland, but the Americans hold off the Confederate advance, and invade the British Dominion Canada.
1914- Germany crushes the Allied lines in Belgium and advance into France, but are stopped at the Battle of the Marne.
1915- Confederates in New Mexico and Arizona invade Nevada, Colorado, and California, and the Western Campaign begins, which lasts into 1917.
1915- The Battle of Manhattan occurs between the navies of the United States, Germany, and Austria against the British, French, and Confederate Navies, ending in a costly Central Power victory.
1915- America breaks through the Anglo-Canadian lines and a small German army outfights the Russian army.
1915- T'sar Nicholas II takes command of the troops, and his poor leadership causes massive losses.
1916- Wilson is defeated by Confederate president Joseph Jackson Smith for dragging the CSA into war(the reason he won reelection in our timeline was for keeping the USA out of the war).
1916- Pro-United States black slaves revolt, and are massacred by the Confederacy, which America uses as propaganda against the Confederacy.
1917- America wins the Western Campaign when General George A. Custer outflanks and defeats the Confederate Army(he survived because no Battle of Little Bighorn occured).
1917- Germany finally defeats Russia and Russia decends into anarchy.
1917- Yankee troops break through the Confederate lines and invade Virginia, the U.S troops in the west invade Texas, Arizona, and New Mexico, and force the Canadians to surrender.
1918- The United States captures Richmond, and forces President Smith to surrender. America declares victory, and turns her attention from the Confederacy to Europe, where Germany is planning the Summer Offensive.
1918- A German-American invasion occurs and Paris is captured; the British navy mutinies and Britain is forced to surrender, ending World War I.
1918- The American people celebrate hard in finally winning revenge against the Confederates, and the Treaty of Versailes places outrageous terms on the Allies(Britain is forced to relinquish her empire to Germany, the North Western area of Virginia, New Mexico, Arizona, Texas, and Arkansas are annexed by the United States, and the Confederate army is limited to 100,000 troops, and two billion dollars in reparation are given to Germany and America by the Confederacy. Russia loses much of her western border with Germany, out of which the countries of Poland, Latvia, Lithunia, Estonia, and Finland are created.)
1923- A former Confederate veteran and extreme racist, Albert Featherstone, takes the lead of the 'Vengeance' party(analogous to the Nazi Party) and begins campaigning for the presidency.
1929- American stock market crashes, causing the Great Depression.
1933- Featherstone is elected president due to his promises for a new economy, and revenge against the Central Powers.
1935- Featherstone approves a massive rearmanent program and unveils a new airforce and tank divisions(analogous to the Lufwaffe and Panzers).
1936- Italy's monarchy is overthrown and a republic is declared(Italy was an allied power in World War I) and signs a friendship pact with America and Germany.
1937- Japan invades China, and America supports China.
1938- The Confederacy's battleships Davis and Semmes(analogous to the Bismarck and Tirpitz) are completed.
1939- Russia invades Poland on September 1st(same day Germany invaded Poland in our timeline) Italy and Germany declare war on Russia, in response, Britain and France declare war on Germany and Italy.
1939- America declares war on Britain, France, Russia, prepares for war with the CSA.
1940- Japanese bombers attack Pearl Harbor(leading the US to officially declare war on Japan), Russia siezes the Baltics.
1940- Battle of Finland ends with a Russian victory, Holland and Belgium are attacked by Germany because they were discovered harboring British and French troops.
1940- Norway declares Neutrality, but Britain invades it to prevent iron ore from getting to Germany, in response, Norway declares war, and with German and Italian support, staves off the Allied attack.
1940- Holland and Belgium are liberated by Britain and France, and British troops in North Africa invade Italy from the south.
1941- Canada invades America, and the Confederacy launches a massive attack on June 22(same day Germany invaded the Soviet Union) Illinois, Ohio, Michigan, Minnesota, and Wisconsin are captured, splitting the American front in two.
1941- Allied troops advance into Germany, and begin an invasion, though German and Italian defenses cause massive losses.
1942- Battle of Midway occurs, and America begins to push back the Japanese.
1942- Battle of Berlin ends in Allied victory, leaving America alone to fight the Allies.
1942- Battle of Washington D.C. occurs, where Americans lose millions of men, but win, turning the tide.
1943- Italian and German rebels, spurred by the American victories against Japan and Italy, revolt, and begin guerrilla fighting, further weakening the Allied Lines.
1943- China defeats Japan at the battle of Beijing, and and a Sino-American force lands in northern Japan.
1944- Americans retake Minnesota and invade Virginia.
1944- America develops the Atomic Bomb one year early, and uses it against Richmond. Richmond is nearly destroyed, and Featherstone, the CS government, and leaders of the army are killed, the Confederate governors now in control capitulate and Canada surrenders when threatened with the Atomic bomb.
1945- In March, Britain and France try to finish their atomic program, but fail to when their research sites are bombed and the British fleet bases are bombed.
1945- April, 2 million Central Power troops cross the Atlantic ocean and land in England, quickly overwhelming the British army, and capture London.
1945- They cross the English channel and invade France, which is overrun two months later. August begins with the defeat of France, and the invasion of Holland and Belgium, which are crushed, and the Liberation of Germany.
1945- American troops cross the Rhine and liberate Germany, and bomb the Russian bases on the original border between them and the east. Death camps filled with black prisoners are discovered in the Confederacy.
1945- Italian rebels succeed in overthrowing their Allied Occupiers, and join the American led force in invading Russia. America announces the Death Camps to the world.
1946- Millions of American casualties occur in Japan and Russia, but victory is assured when America bombs Hiroshima and Nagasaki, and threatening to do the same to Moscow. Confederate Death camps are liberated, and the Vengeance party is outlawed, and remaining Confederate officers are tried for crimes against humanity(analogous to the Nuremburg trials).
1946- Russia surrenders, and America declares victory, but it occurs at a terrible cost, 10 million military deaths in the entire war, aswell as the loss of 50 ships in the navy, including two aircraft carriers and 10 Battleships, even so, the war ends following America's victory.
1947- A pole is opened for whether or not to absorb the Confederacy, but poles showed only 7% wanted it, America had suffered to much because of the south, and they wanted nothing to do with them, even so, America occupied it, along with most of continental Europe, though Germany and Italy occupied Europe the most.
1948- Former Central Power and Allied Power relations improve as they treat the allies much better, and fraternization occurs between soldiers and civilians.
1949- Germany develops the Atomic Bomb, and the newest Kaiser, Friedrich VII makes Germany a constitutional monarchy.
1950- America and the Confederacy sign a pact of friendship, and American troops leave the Confederacy.
1960- American soldiers leave Europe, and Russia launches Sputnik.
1969- Neil Armstrong is the first human to walk on the moon.
1970- Civil rights movements for blacks are victorious, and slavery is outlawed in the Confederacy.
I will update this later on.