The US instigated the 1916 Program to be 'second to none' because of Germany not GB. As they voted on the appropriations their speeches were full of praise for the RN. The 1916 program was the result of the General Board's long running fear of a German-Japanese alliance necessitating a force of 8 battle squadrons to hold both oceans. The fact that this was the size of the RN was a coincidence. I agree that in any 'disarmament' or arms limitation treaty Germany would never agree to equality with the United States. They certainly were not interested before the war with either the RN or the USN.
Yes.
Germany instigated USW in early 1917 because they assessed that bringing the US into the war would take a year and that Germany would have won the war by then, this is despite the fact that at the time the entire US Army and NG was mobilised along the Mexican border. Their first assumption was correct, the US Army didn';t begin to conduct Corps and Army level operations on the Western Front until June/July 1918, well over a year from the start of USW. Their second assumption was wrong, but not wildly so as they were able to drive the Italians right back, knock the Russians out of the war entirely and conduct major offensives in the west before the Americans arrived in force.
However by 1921 Germany will not be able to make such a calculation, the USN will be both huge and a balanced fleet and the ground forces will be some 700,000 men rather than less than 200,000 in 1917. This will change the balance of power globally, it will mean the USA is actually a superpower.
The triumph of lawless authoritarianism over a rules based international order. There is no way that will result in a better world. Just sayin.
If Germany had remained under arms limitation - there would have been no Holocaust.
What lawless authoritarianism? The German Empire would undertake some political liberalisation postwar, it had already been mooted in 1914 and publicly announced at Easter 1917. The Soviet Union would still be a genocidal basket case, but it wouldn't hold the Ukraine (or at least as much of it as OTL) and possibly other territory it held so will have less people to kill by collectivisation and purge.
Keeping Germany down with a more successful ToV regime and perhaps something about the League of Nations would be a different TL (worthy of its own thread) and not relevant to this CP victory scenario. However, how would a victorious Germany and surviving AH feel about a League of Nations?