Without a US intervention in WWI, what would have happened?

[Pirx]

Capture Paris in 1918 was as possible as capture of Moscow in 1941. Convoys to France and UK couldn't be stopped by u-boots in WWI.

Ludendorff could use more time to build up an even larger, huge force of millions of men and thousands of guns to smash his way to Paris

Impossible mission!
milions men? from Poland or Ukraine? in 1918 to army goes 16 year old boys and over 55 years old grandfathers! all bells were confiscated. People were starving. No iron ore for new guns! no oil! no rubber! France also was weaker and weaker, but cargo from all over the world was incoming. And to win war they need no huge army but well equiped army

[Helmut Von Moltke]

Pirz, you may be right about the U Boat war but remember that several of Ludendorff's offensives were succesful at the start but ground down, and they employed huge amounts of men splattered all over the Western Front. If Ludendorff conecntrated all of them on one gigantic offensice target, Paris, it is possible he could have a higher possibility of winning. After all, the German force which was marching to Paris in 1918, was only 40 Divisions strong and was halted on the Marne, but imagine is it was 60 or 70 divisions. Anda bout cannons, remember that in the first "Kaiserschlact" in March 1918 the Germans deployed 8000 guns and mortars...

K

[Pirx]

February 1918 was battle near Narwa. Germans against Russians. From one side veterans from long war, on the other sailors from Baltijskij Flot. Sailors were rookie and had no idea how to fight on the ground. They were trained to fight on sea. So after short battle most of them escaped (with their comander Dubinskiy). Road to St. Petrsburg was open. What Germans do? Also withdraw. Why? No supplies. German commanders decided retreat after won battle coz they know that hungry soldier with few bullets can not occupy big city.
Also on western front it was last chance to change something but they were out of reserves. Not only human but also materials.
In 1944 Germans had much more divisions than on beginning of 1942. But value of those divisions was very very low. Similar to 1918.