Was the US Army during the WW2 Western Front a motorized army, a mechanized army, or neither?

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I can find no evidence of mechanized infantry divisions in the U.S. order of battle for World War two. This is what I expected. Armoured personnel carriers were new and expensive throughout World War Two, and for all nations their use was generally limited to the (third) infantry regiment of armoured divisions, and to the reconnaissance and heavy weapons support platoons and companies of other divisions.

The U.S. Army officially designated just five divisions as motorized infantry in World War Two, and only for the period 1942-3 (The 5th was a phantom, part of USFAG for the D-Day deception):

However, I am unable to determine the extent to which these units were truly motorized. Typically they would have been assigned to Armoured Corps, where their extra mobility would be most useful.

There were also three light division, designated respectively as Alpine (the 10th), (mule-)Pack (the 71st), and Truck (the 89th). The last appears to have been a fully motorized division, but deployed to Le Havre only on 21 January, 1945 and saw only relatively light action. It did participate in the overrun of Buchenwald on 4 April 1945.

The remainder of U.S. Army infantry divisions, excepting mountain and airborne, were foot-transported. However, note that the mobility of a foot-transported divisions is more commonly limited by its logistics than by walking pace; in this all U.S. Army divisions were supplied with plentiful trucks for transport of headquarters units, artillery, supplies, and the rest of the tail.

Where the German Army relied on horse-drawn logistical support for the entire war, most likely due to the extreme scarcity of valuable gasoline and diesel fuel, the Allied armies were much more mobile due to being able to relocate support troops, supplies and headquarters units forward much more quickly. This can be seen in the speed of the Allied advance across France after Avranches and Falais.

In closing, recall the vast number of landing craft that the Allies, and particularly the U.S., employed throughout World War Two in both major theatres. These are, in essence, floating Armoured Personnel Carriers. The use of precious production capacity in their manufacture instead of simpler tracked APC's seems, to me, eminently reasonable.

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I would argue that both the US and Germany where mechanized, rather both had mechanized components; while only the US was entirely motorized. The US β€œhorse” in WWII was the JEEP.

Russia, 1941. SS Cavalry Brigade enter image description here The German army was not motorized. In Poland, France and Russia the German army was dependent on horses to carry supplies and even troops to the front. The German Army entered World War II with 514,000 horses, and over the course of the war employed, in total, 2.75 million horses and mules; the average number of horses in the Army reached 1.1 million.

In 1939 the United States Cavalry consisted of two mechanized and twelve horse regiments of 790 horses each. However by 1942 The United States entered WWII as a fully motorized force. As World War II progressed, most major armies integrated tanks or assault guns with mechanized infantry, as well as other supporting arms, such as artillery and engineers, as combined arms units. The US produced about a half dozen armored personnel carriers totaling about 70,000 vehicles throughout the war(see below). These included the M2 Half Track Car (13,500), M3 Halftrack (41,000), M8 Greyhound (11,667), M20 Armored Utility Car (3,680) and the M9 Half Track Car (3,500).

Total production of the M3 ran to nearly 41,000 vehicles.To supply the Allied nations International Harvester produced several thousand of a very similar vehicle, the M5 Half-track for Lend-Lease. It was used by the US, Britain, and the Soviet Union through out the war. Variants included Armored personnel carriers, self propelled guns, mobil Anti-aircraft units, and 40 mm. 50 mm carriers.

Total production of M2 and derivatives was about 13,500 units. To meet the needs of Lend-Lease to the Allies, the International Harvester Company produced 3,500 units of the M9.

The US Also produced about 11,000 M8 Greyhound Armored Cars M20 Armored Utility Cars (3,680),

U.S. M3 halftracks and infantry on exercises, Fort Knox, June 1942 enter image description here
Kangaroo APC carrying British infantry, 1945 enter image description here

The US armored infantry was fully equipped with M2 and M3 halftracks. In the British and Commonwealth armies, "Type A armoured brigades," intended for independent operations or to form part of armored divisions, had a "motor infantry" battalion mounted in Bren Carriers or later in lend-lease halftracks.

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