We study the profitability incentives of merger and the endogenous industry structure in a strategic trade policy environment. Merger changes the strategic trade policy equlilibrium. We show that merger can be profitable and welfare enhancing here, even though it would not be profitable in a laissez-faire economy. A key element is the change in the governments. incentives to give subsidies to their local firms. National merger induces more strategic trade policy, whereas international merger does not.