Here is a WW1 era US made 75mm high explosive shell and brass casing. The projectile has the original paint, which was yellow, but has faded over the years. The projectile is unfired as evident by the driving band at the base. The US made these shells for the French forces as well as US troops who were using the French 75's. The US did have some of its own artillery, but not much made it overseas, and to ease logistics it made sense to use the French and British pieces already in theater. 
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