No Soviet Union as the Czar would not have been removed.
The Czar abdicated the month before the US entered the war, although he'd essentially consumed all his political capital quite some time before that. The two events are unrelated.
With the US not in the war, it is possible the Germans might have been able to more aggressively attack Russia, and it is certainly possible the Bolsheviks might not have come to power. The Germans probably would have held onto much of Ukraine and western Russia, Baltics, etc., either directly or thru puppet governments.
“No Soviet Union as the Czar would not have been removed” no he WOULD have been removed eventually just not a soon as 1917.
On the other hand, Poland may never have regained her independence.
I’m not sure about that one.
The US didn’t even declare war on Germany unto early 1917, and did not have an effective army in Europe for about a year.
The Bolshevik revolution started in late 1917, and had been brewing for a while.
With or without the US, the Czar was probably a goner.
By as early as 1910 the Russian People were gettting a “Belly-Full” of the Tsar and his WORTHLESS inbred(he was first cousin to Kaiser (V)Wilhelm(Germany) AND a cousin to the King of Englend) BLEEDER family and would have revolted just not a early as 1917. His WORTHLESS “Generals” and a concieted attitude did him in(that and France had been coddling and providing Lenin aide and comfort for years).