Mercury. Big Mercs are still made here, still in Fond Du Lac starting with the 150 HP class.
The newish V12 600s, the new V10 400s, and the V8 and V6 are all made in Wisconsin, USA, and the plant is really state-of-the-art.
Mid range Mercs are made in a “Mercury-owned” plant in China, but are of US design. (Like anything in China is really “owned” by us?)
Smaller Mercs are made by Tohatsu in Japan. The large engine market is very competitive, with Yamaha and Mercury really duking it out. Surprisingly, Mercury is actually gaining market share, which is one small sign of encouragement, in an otherwise-dismal American outlook.