US casualties were 354,523 dead and wounded, the Japs had 2,133,915 along with an extra 1.2 million dead Chinese collaborators that fought alongside the Japanese(Won't include them due to a small amount fought against actual US troops). For every one man we lost they lost 5. That's not a hard fight, it's a damned slaughter. Sure it was brutal, sure it was fucked up, sure it was probably the harshest fighting seen at that point of history, but the Japanese still lost many, MANY more men, and in the end it was a steamroll.
Meanwhile in Africa it was 220,000 Brit losses, 20,000 lost Free French and 18,221(And the US was here for what, half a year?) against 22,341 Italian casualties and 21,994 for the Germans. Even if you tack on the Vichy fucks(3,343 total) the Allies still took EXTREME Casualties compared to the Pacific.
Also Duuring, the Dutch lost 900 people in combat. You did lose a good 8,000 in deathcamps though, so God help those poor souls.